I don’t think it’s moral to be able to sue a third party for something that another user did though. Like I definitely agree they should have some sort of reporting system active which they do, but it’s not ethical to sue someone who isn’t involved for Content that someone else did.

Let’s look at it from a hypothetical scenario. you’ve decided you want to run a lemonade stand, you become popular everyone in the neighborhood comes to visit your stand. Your town unfortunately has a quite racist sector, knowing this you have put up signs saying please be respectful , we hold the right to refuse service to anyone, and not surprisingly this group decided to come visit as well, a fight breaks out between that section and another group that’s attending your stand. People are hospitalized, instead of them suing the people who caused the injury they’re now suing your lemonade stand because you never stopped people of that group from showing up in the first place.

This is comparable, steam provided the environment to allow for the posting(the stand), they provided a terms of service / guideline of usage for the platform(the signs), they provided a reporting system to be able to report the misconduct to get people banned by both forum mods and official mods(the right to refuse service), people ignored the last two systems and did it anyway, and now people are saying that they should be responsible for people ignoring the rules and doing it anyway.

Ethically, they have done enough that the system practical and should work, if people use the tools that are provided

Morally they are not responsible at all since they’re in independent third party they only provide the infrastructure and they have put practices in place to help avoid a situation like that happening, while also abiding by US federal laws which is where steam is HQ’d