Privacy is not a yes/no flag, you can have different degrees of privacy across different types of activities online. I said I wouldn’t mind them monitoring my game activity if I found it was used to improve one of their services. I was speculating. Just like you speculating that they do harvest the data and that they sell it to others ( not sure where that came from ). Also since you mention a steam account, do you think they’re not harvesting your data so they can sell you things ( at the very least ) ? Why are you giving up on privacy?

Point is if you’re online your activity will be monitored. If you want privacy play offline games on an offline machine, preferably on linux. Otherwise start to think about all the tools you use and if them harvesting your data is worth what you get in return

Pretty sure they do it but I don’t mind it that much. If they’re using that data to improve DLSS or whatever then it means at least it’s helping to improve a service.