

Most likely. That’s if people knew about. You could do it secretly.
Though I wonder if you were open about it, if people would accept it. Just say “hey, this instance doesn’t ask for donations, but we track and sell your info.” Maybe some users would be okay with that.
Remote instances won’t have your IP or email, and other usage trend data. So that info could only be obtained by this hypothetical tracking instance. As for any remote content on other instances, that can just be scraped by anyone. You wouldn’t even need an account or instance to get that data.