Valve moderate steam forums themselves, unless companies opt out. But that’s only a relatively recent thing.
Valve moderate just their own boards OR tend to have global moderators intervening only in case of very explicit illegal behavior.
For any other case, every company is supposed to pay attention to and to moderate their Steam boards, IF they care enough to be bothered with it.
If it's going to be paid "social media manager", volunteers or developers themselves in their spare time is up to them.
