A person can choose to install anti-virus software, or to not install it. And they can choose when it runs. So that’s a key difference. The anit-cheat software is not there by choice.
As for not stealing personal information… yeah, I’m sure all the private companies involved from all over the world are very diligently handling this of the data in a highly secure way, and are acting consistently with USA’s very strict privacy laws… Except that the USA doesn’t have strict privacy laws, and the security record of game companies in general is not stellar; and it’s very hard to tell what happens behind your back.
You’re giving the company kernel level access to your computer. That basically means they can do whatever they want. And you can’t really tell if they are behaving themselves beyond them just saying “trust us”. Maybe everything is great. But I wouldn’t count on it.
No quantity of counter-content can overcome the person who controls what posts are actually seen by other users. Staying on X can never lead to any kind of balance. Staying there only serves to prop-up the false sense of legitimacy.