I think it does have it, it’s placed like the home button on older iPhones.

Yep, just googled, that’s a samsung galaxy s5 and it did have a fingerprint scanner.

reasonably sure memmy’s ios only for now :/

IMO memmy is super nice and polished (the best app so far), the lemmy.world servers are pretty hammered at the moment, but they are due for an upgrade in the next few hours, so theoretically everything should get better. wefwef is pretty cool too