At the same time, it might not fit them. Lemmy is a link aggregator, which seems like extra functionality that they don’t really need, not when existing forum software will do what they need, while also being more stable/mature.

Since I’m now using a password manager I’ve been having less issue with creating as many accounts as needed.
But I do agree it’d be great to have a single sign on.

Federated logins are a thing! The challenge is finding one that’s open and privacy-friendly. Unfortunately the widest-used ones come from entities like Google or Facebook with a marked interest in preying on user data. Mozilla used to maintain a federated system (Persona) but they discontinued it. I know Ubuntu offers one for all their services (bug trackers, forums etc.) but not sure if it’s open to third party systems. Perhaps there are others worth using.

Alternatively, you can aggregate all your logins in one place across devices and browsers. Firefox Accounts are a very simple method of doing this (presuming you use Firefox everywhere), and you can choose to only sync logins rather than bookmarks, plugins etc. And of course there are other dedicated password managers, with or without online sync, open or closed source, self-hosted or private hosted etc.

I’m old enough to remember dialing into different BBSs with my 14.4 Kbps modem.

These days my teenaged son is complaining that his 12GB Fortnite update isn’t downloading fast enough and he has to wait a whole 20 minutes.