I don't see how any aspect of this prevents you from allowing a channel to Let's Play (and/or monetize) your game. If it's an indie game that you own the copyright to, you can absolutely give other people permission to LP the game.
Sure, but to give individual permission to every single let's player channel/streamer/quick look/review channel out there on YouTube, big & small is nigh on impossible, since:
1. Our team simply wouldn't have the public reach to get all our bases covered, even if we had a disclaimer on our site or on social media networks. It is a huge pain on our side of things too.
2. All these channels, not just LP ones, are getting automated ID claims. That's hard to work around. If people are accidentally getting flagged, even though myself as a developer am totally fine with it, it's unlikely the flagged channel will even bother keeping the video up and losing us the promotion we could of got.
Sure my personal stance on is, well, 'maybe I'm just not a bit of a dick about it'. It's less unlikely copyright claims will happen with people playing a game from a small indie team, but the snowball effect with this happening on mainstream games is that, it's affectively stunting content creators, to actually, you know, create content on their channels, if they're afraid they will get everything flagged.
When we released our mod last year, we were briefly doing the rounds of some of the big channels, which resulted in a truck tonne of emails from smaller channels asking if they could Let's Play a free mod. It may be common courtesy of them to ask, or misinformation of them believing we purposely targeted those channels, but at the end of the day, it they were already fearful of permission from a team of nobodies, what mindset are they going to be in now?
I don't want this barrier to exist between a channel & developer, because it affects a potential consumer watching their video. Our mods popularity was the effect of Pewdiepie
choosing to play it, and something unlikely possible to replicate if we tried asking him first (he may ignore our request since he probably gets thousands of emails). And since that has happened, we have a small foothold in the door of that scene to then get them involved when we release our commercial game, because they'll remember us from before! (maybe).