More and more sites are moving away from allowing users access when creating accounts with temporary or alias addresses, and usage with vpns. Identity based accounts can’t be tracked if they don’t know your true identity.
In the not too distant future, everything you do online and off will be connected to your real world identity.
I can only answer why I dropped Windows. I wasn’t going to pay a company to force AI spyware onto my system, ignore my commands with every update that negated them, or hold my data hostage if I didn’t jump through their endless hoops; all to claim my data as theirs with their end goal being to charge me more money for accessing what is supposed to be mine in the first place!