I don’t think it would have the intended effect. What would happen if that captchas wouldn’t be useful for AI training, but it’s not like a car is sitting at a stoplight waiting for a person to identify if something is a bus or not.

Lol, getting 10 thousand users to slightly inconvenience themself even to stand against things that directly effect them is difficult. Imagine trying to get billions to do it for a slightly indirect possible effect on megacorps.

There are probably half a billion people alone that would gladly lick the boot of any mega corporation that demanded it.

Given the number of bots on the internet trying to crack captchas, this is already happening. I don’t think captchas are being used for AI training that much, since hCaptcha uses AI-generated images with prompts like “Select the images with a hamster eating a watermelon” for its tests. All of the reCaptcha road captchas I receive also have answer validation and won’t let me pass if I answer incorrectly because of a misclick.