they're just discriminating
against Firefox users?
At least part of the behaviour shown in the video depends on factors like cookies, IP address, and whether you have features like anti-fingerprinting protection turned on. [1]Recaptcha is frustrating and I dislike it, especially the slow fade-ins and multiple challenges, but if you repeat the test shown in the video you won't find it 100% repeatable just because you're using Firefox.
[1] https://github.com/google/recaptcha/issues/268#issuecomment-...