HariKari nailed it in the other thread:
The crux of the issue is that modding has always been this free thing on the side that has enhanced games, authorized or not. It being authorized is not the magical green light to profit land everyone thinks it is. When you've got major stakeholders suddenly involved in what was largely a passion hobby, shit is going to go sideways real fast. They are the gatekeepers in a paid system. They can pick the winners and losers. They can decide who even gets to play.
Everyone should be asking why this seems equitable, not searching for some sort of silver lining. The premise is bullshit. Valve and companies that take part in this are going to spin some serious yarn about it being good for creators, while they lop off 75% of every transaction. It's really about profit for them, not enhancing the community.
We're already seeing stolen mods, early access mods, all sorts of crap. This is a poorly implemented feature system that is meant to generate revenue for Valve and its partners, nothing more. If they cared, they'd curate and moderate the store rigorously, and they'd also not be removing donation links. There'd be a "pay what you want" option. There are many ways to do this better, and in a way that's more beneficial for the modders and the consumers.
Instead, we get another IV drip of money hooked up to Valve and we're all supposed to smile about it.