EA (and to some extent Valve) is also well known for profiting very heavily off of getting people addicted to gambling in the form of loot boxes. Also EA's former CEO said that they should capitalize on gamers in the heat of the moment to charge in-app transactions, like pay $1 to reload your magazine mid-combat in Battlefield. They're also notable for charging tons for DLC. Overall just very money hungry and gross.

Valve is not very good at censoring profitable fascist games from their marketplace (which goes in line with Gaben and his freedom takes). Valve also takes like 1/3 of the price of the game for themselves, which is pretty high, especially for indie game devs who don't yet have many sales, and given that they have a de-facto monopoly. They also tried really hard to break EU and Australian law and not allow for refunds on games beyond very limited circumstances. Their work culture is also notoriously sexist and transphobic.

I think Valve is probably the lesser evil of game companies but I think that their reputation is much much better than it should be given all this shit. That being said, as a enjoyer I'm happy they are trying to get gaming on Linux working better, even if it's just for their own selfish interests.

They're not as detestable than the other guys

That’s the thing. Valve hasn’t really done anything. They don’t make games anymore. They just sell you shit. They have some controversies but nothing really worth caring (wrt steam) about except that one time they allowed mods to be charged. As such, you don’t get too many reasons to hate it outside of principle, which is fine, but no one else cares enough to make an alternative.