This is bad advice. Federated identity and oauth are great tools. You need to use the right identity provider.

When some random website gets hacked and has its authentication database dumped your credentials won’t be in there.

You can see what a website has access too from your identity provider.

It’s federation. It’s a trust model. Like the fediverse.

Most people didn’t use the internet when the first iPhone came out either. That shit was slow and unusable at the time, and locked to AT&T.