I personally am fine with this.
Well the good news for you is that a website specifying one or the other is nothing more than marketing from that app maker! So long as there is a QR code (or a long random-ish string), you can use any authenticator app that supports that website’s 2FA algorithms!
That last bit is important because I think Lemmy had a non-standard 2FA algorithm (SHA-256?) that wouldn’t work with Google Authenticator.
that’s good to know. I’ll just switch everything over to google authenticator then.
Lemmy works with Google Authenticator, but not with Authy.
Annoyingly Authy fails silently and ignores the part of the code that specifies SHA-256 and just generates a SHA-1 code that won’t work with no warning or indication to the user.