Eh, anonymity is great for some things, less so in others.

But burner emails are pretty much as anonymous as it gets on the fediverse. If you pick a random user name and cycle to a new account fairly often, you're anonymous to other users. A VPN mostly anonymizes you from the instances.

Being real though, that's kinda dickish to the instances because you're wasting the tiny bit of resources used to create accounts. If you do it often enough to really anonymize, it adds up.