It feels like I have to go slowly through it only for it to eventually end in a “please try again” as I sit and wait ten seconds for each square to slowly fade in a new stupid bus for me to click.
How is this fair to the humans?
There is no good automated answer. Things bots do to abuse web pages should be made illegal and then jail (fine...) the people who set the abusive bots loose - but I suspect most abusive bots are foreign and so we can't do anything without sending in an army (obviously unacceptable)
Cognitive overload. There's days I'm just straight up tired and don't realize it until I'm at least one "please try again", page refresh, and endless traffic light game later that I'm probably in the tarpit and wonder why.
The weird thing is that I don't KNOW why. I use good ol' consumer Chrome, good ol' consumer MacOS, a consumer ISP, and my IP isn't in any kind of reputational blacklists that I'm aware of.