I’ve installed from steam after downloading it the deb from the website , and steam self updates. I never had issues on mint, Ubuntu or popos for years.
I really don’t know much, and anyone should take this with a grain of salt: but in my opinion any other way of installing steam on this branch of Linux is asking for trouble
In my region ( USA), ordinary people simply don’t have the resources for individual lawsuits like this.
It would have to be a well connected or monied individual to have any chance. Or the situation is so egregious and documented enough, that a law firm thinks it can make money, by taking most of the winnings from the victims