I've found that doing stuff like devlogs, participating in Screenshot Saturday, etc. can help devs get noticed. Although I'm mainly speaking from my own experience, since I browse Twitter, TIG, and Reddit every weekend, sites like RockPaperShotgun, Indie Games, Killscreen, and others often use those as sources. RPS even used to do a Devlog Watch, where they'd highlight interesting looking games in development, and Indie Games does a weekly #SS post
Screenshot Saturday and the indie thread here on GAF are great places to look.
Honestly, I'd argue that's in the same vein as not really being interested in a game until someone you trust on GAF or a friend goes, "Hey check this out. It's pretty cool"
It's really no different than browsing Steam and figuring out what you want to check out or play. It's not a malicious "I'm going to keep ignoring this guy's game and refuse to look at it". It's a "I got so many days in a week, need to write X amount of stories a day/week, have so many new releases, trailers, and previews I can write, etc. because I also have games to play for review and need to do life stuff like eat, sleep, and be with family" You tend to choose what looks most interesting, what interests you, what catches your eye
Personally I learn about at least 10 games I've never heard of every weekend, and that's not counting all the press releases I get and the games I see on sites. That's at least 500 new indie games every year, plus games that I already know of that are getting released or getting recent news. It's humanly not possible for me to write about everything I'd love to write about
And I'm speaking as someone who never writes about AAA games, and only writes about indie games. It's not politics. It's sheer volume, time, and interest
This is largely the issue here.
My work day - and people forget it is work - is split between my current review titles, my daily writing, and any previews or events.
I write news, that's 3-4 articles per day. This week I had Deus Ex: Mankind Divided for review. In the near future, I have a review for King of Fighters XIV and prep for WoW: Legion. Outside of reviews for those titles, I probably also have to edit my captured game footage into a gameplay video, video review, or the like. I have three interviews - one with the indie team behind SNOW - that I have to find time to transcribe.
That's not counting the indie games that are on my desk, including Necropolis, Rimworld, Starbound, and Loot Rascals. Or the numerous games that I'm interested in that are in various stages of development.
I review comics on the side. The time commitment for that is the time it takes to read it. 10 minutes tops. For a game? That can be anywhere from thirty minutes to many, many hours. I barely review comics anymore because games are taking up all my time.
Most of the indie time I get is at PAX East and West, where I try to set aside a day to wander the booths and see what captures my interested. Divested from the day-to-day work, I get a chance to see some games and write previews to get them in front of people. But that's A) not normal and B) requires me to actively shut out appointment requests to make it happen. If I didn't do the latter, my PAX would purely be appointment after appointment with little downtime.
None of this is a whine, by the by. I love my job. But this is the reality of it. I have a limited amount of time and yeah, we have to write about certain games to keep the lights on. (Which is a function of readership.) There are games I'd like to spend a lot more time with - Rimworld for example - that I can't because I have other responsibilities.
So yeah, it's a problem I'd love to fix, because I love indie games. But I don't have the answer for you. It's hard out there and there are way too games these days to give everything ample coverage. Finding that balance is an ongoing struggle.
EDIT: To flip it around, think about it this way. You're focused on getting covered in RPS/Polygon/Kotaku/Eurogamer, but what about focusing on smaller sites? There can be something symbiotic there, but I find most want coverage from the big ones because they get the most out of it. More eyes, greater visibility. Because their time and effort is finite. The same is true of media.
Some perspective from the writing side
Here are the places I go to find games to cover for Screenshot Saturday posts on NeoGAF and for sites
http://www.screenshotsaturday.com/
https://twitter.com/hashtag/screenshotsaturday?f=tweets&vertical=default&src=hash
https://www.reddit.com/r/gamedev/comments/4yn2oy/screenshot_saturday_290_limited_edition/
https://forums.tigsource.com/index.php?topic=24094.7920
Of those 1,000+ tweets and posts by devs, I narrow it down to 15-20 games
(And those 1,000+ posts to dig through? That's 1,000+ every week)
https://docs.google.com/document/d/1OffwrAU18O0ixMr3ssZS_vYNEWYa6Kf5QMJqvdK3fms/edit?usp=sharing
Then I choose the 5-7 most interesting out of those to write about, sometimes a few more.
http://indiegames.com/2016/08/screenshot_saturday_highlights_8.html
I'll post the longer list over in the Indie Games thread
http://www.neogaf.com/forum/showpost.php?p=213572943&postcount=103
Or the Screeenshot Saturday threads before the number of screenshots became too much to load well
2016:
http://www.neogaf.com/forum/showthread.php?t=1165572
2015:
http://www.neogaf.com/forum/showthread.php?t=1092948
And that's how an indie game can easily be overlooked
And you cover indie games only!