[edent]

It depends who you are trying to defend against.

General spammers? Get a cheap / free SIM card every few months to rotate your number. Per domain email ([e-mail]) makes it harder for people to match your emails between services.

Firefox containers, adblock, cookie control stops general tracking.

If you don't care about the longevity of an account, just sign up for a new one. Reddit makes that pretty easy, for example. That'll stop most people tying your Bigfoot Erotica to your political campaign.

If you want to defend against a nation state tracking you... Well, you can try using cryptocurrency, VPNs, disposable VMs, and solar-powered batteries from your cabin in the woods - but you only have to slip up once.