Apparently Ryujinx the switch emulator has been removed even though it used unique code and the speculation is the owner got paid off to delete it. Makes me wonder if they get you either one way or another

Theres a few answrs to this

1. It uses your movements before this to determine whether it feels like your a bot or not
2. It makes you wait, the biggest issue with bots is they may try to log in say 50 different passwords for example, so if it takes 5 seconds to do each one it makes boting multiple acounts not worth it.
3. Google uses catchphas with images to choose. They use this to train their own AI or data to sell