> On an unrelated note, I have found captchas that don't even work and reprompt me all the time

Modern captchas do a lot of background work regarding how human your inputs look, whether you have a human-seeming fingerprint, etc. Often when I'm behind a VPN and on Linux I have the same issue, because my setup simply looks "too botty" no matter how good I am at telling which squares have a firetruck in them.