What happened with steam?
Quite a lot of things over the years. A noteworthy example being that it used to support larger fonts for people with vision issues, because GabeN had bad vision, but almost immediately after he got laser surgery he was like "k don't need that any more" and since then, they didn't just remove the in-built options for larger fonts, but made changes to how skins work to make it harder to add them back.
For me though, in 2019, the Steam client got an update which has turned it into a literal health hazard. It's an active trigger for a variety of photosensitive medical conditions. I get migraines and it's affected me really badly - spent about a month bordering on hospitalisation almost daily because of it, before finding out that the Steam update was the cause.
Numerous people have identified a variety of (mostly easily-fixed) causes for this behaviour in the app, and Valve's responses so far have included:
-admitting they knew within days of the problem starting, but promising not to take appropriate action to fix it.
-repeatedly gaslighting people affected by the issue.
-intentionally violating privacy laws in multiple ways while trying to dodge liability.
-on multiple occasions, directly abusing customers asking for help, including at least 2 instances I know of where they tried to coerce customers into self-harm.
At this point, that's more than sufficient levels of horrific behaviour for me to say that even Epic would be a better choice at this stage.