Apple sold this feature as an alternative to captchas.

In order to sign up for Lemmy, I had to pass a captcha check to prove I’m human. Now that bots can trivially be better than any human at captchas we have to find something else. Is attestation a good option? We can debate that, but it’s definitely on the table. And I expect Firefox will implement it (even if only via a plugin) if it becomes widely adopted.