For me, I don't want more of my data going to Facebook than they already have. I haven't used a Facebook product in ~5 years or so, but I'd imagine that as a Playstation and Microsoft gamer that if I did ever play an Act-Bliz game, then a certain amount of my data would be shared with Facebook, as Sony and Microsoft share data with partners on the platform. There's an opt-out mechanism on Xbox (and I assume PS5, but I don't have a PS5 to confirm), but it'd suck if some product i liked got bought by Facebook and I had to stop using it. Microsoft, IMO, is not as nefarious as company with private data as Facebook is, which IMO, is the most irrresponsible owner of large amounts of personal data on earth. Facebook actively spreads harm with the data that they acquire and show no reticence for the harm they do. I don't really play any Act-Bliz games, but I tried Warzone last year, but would probably not try any of those games anymore if they were owned by Facebook.
I feel similarly about Oculus. If Microsoft or Sony bought Oculus, I'd try/buy an Oculus. I'd create an Oculus account. When Facebook bought Oculus, that fomented that I'd never buy an Oculus. I consider Facebook to be one of the most actively nefarious/negligent/malicious companies in the world, and also one of the most powerful organizations in the world. I think their record over the last 10 years, and 5 years, and 2 years has proven that out, and they show utter hostility to criticism from regulators and critics, far more so than most other major tech organizations. Facebook is more malicious today than Microsoft was 25 years ago, and they're far more powerful today than Microsoft was 25 years ago.