This is basically what Reddit did to me. They suspended all of my accounts (and new ones) because I got too loud about how moderators are treated. It's interesting how much "corporate justice" and autocracies have in common.
They use a combination of browser fingerprinting and IP address for identification, but you can still create a new account and access it via VPN.
It's just not really worth it except in a few rare cases when you want to ask a specific sub a narrow question.
The main subs have lost all meaningful quality.... Even the larger tech subs like sysadmin are garbage now