Not quite sure how I feel at this time about the whole "one login, many forums" idea I've read about... I remember something sort of similar being tried back in the early 2010s, and if I recall correctly it ended promptly when one malicious forum owner decided to add what was essentially a keylogger to his forum's login page to harvest logins to access other user's accounts on other forums... and I'm not quite sure I'm aware of a technological solution, short of mandatory activation of 2FA (which will put off a lot of forum users) that could counter this at the current time.