This was the great promise of the fediverse -- that you would own your profile, and that you would have one profile across the entire fediverse, and that you could migrate that profile from instance to instance if you had disagreements with the admins of your instance -- but it seems to have fallen by the wayside with real implementations, which is disappointing.
If you want one profile across the entire fediverse, then host your own instance? Or link your accounts to one central website you own or to one profile you own, e.g. Mastodon or Matrix.
I don't think "you can host your own instance" is a very realistic solution for the vast majority of social media users. "Just learn to be a sysadmin so you can post memes" is pretty user-hostile.
Sorry. Neither solution affords unified login and is helpful or relevant, but one is worse than the other because it's actively user-hostile, in addition to not working.
Fine, I'll bite. Where's the guide to linking my Lemmy account to my mastodon account so I can use a single sign-on for both. I can't find one anywhere.
That's not what I said. I said you can put a link in your mastodon profile to your own mastodon, your own website and your lemmy account. It will then verify those against your mastodon account. No single sign on possible especially not across different applications (lemmy, kbin, mastodon)