Personally I think people are overreacting. As far as I know you can turn everything off in the settings. People also complained about the privacy-preserving measurement being on by default but I’m pretty sure that was a bug because on a new install it gets disabled when you disable Firefox studies and other collection stuff.
Agree with you there. It’s definitely good to oppose this kind of stuff but I don’t think this is switching-to-another-browser bad. At least not yet…