A lot of people won't like the answer but no private individual should ever trust a corporate entity. They aren't held to the same standards a regular person is so we can only hope that in a bad situation, the company will do the right thing. When there's a difference between right morally, right for the customer and right for the bottom line is the time to start sweating and hoping.
When it comes to archiving piracy is the answer anyways since the average person is not going to be backing up all their games and creating redundant back ups of it.
Thats what I like about what OP linked. But those platforms dont really incorporate all that steam does well. Making it easy to link up with friends is important. Though I have found myself using Playnite instead of Steam to browse and launch my games.
Valve has been the least shit player in the game distribution ecosystem for decades. Maybe they could lower their cut but the push for Linux compatibility is worth any premium they want to charge.
It's funny, because as much as people here hate corporations and monopolies, they would seemingly kill their own mother if it meant Steam would be the only seller of PC games.
EDIT: As demonstrated by these angry downvote reactions.....
It's not that hard to understand when even apps determine whether someone wants to use social media like reddit or lemmy despite the content being the same.