This is where I started to ponder the #zapatcha idea. Altough it wouldn't solve the whole world at once, it would at least offer an alternative for some sites. I will likely do some sample code for it later this year.
quotingJust replace all thw annoying "Click the traffic sign" images with some #zaps
nevent1q…qv93
In most cases just 1 sat would be enough. But could dynamically be adjusted accordingly. Maybe in line with the actual cost of doing the webrequest on the server side.
No matter what a #zapatcha would be worth it to the long version captchas that are as complex as boring minigames.