Here's an example of a captcha-solving API: https://anti-captcha.com/apidoc/methods/createTask

They have a browser extension too, I guess it detects the displayed captcha and submits it to the API

Wow, just wow. This is amazing.

Gotta love adversarial interoperability, productionized

I once heard someone (perhaps jokingly) suggest forwarding the captchas to users of some website you control - e.g. a free porn website where you have to solve a captcha every 10 images.

Recaptchas yield a code when completed succesfully, which can be transfered to a different machine to instantly solve it i think.

Finally repercussions for the sites not updating their recaptcha versions and annoying everyone with v2

"reCAPTCHA v3" despite its name is not a captcha though, it's just a very bad risk-scoring service. Bad because (1) it flags plenty of legit visitors as spammy, in a way that's probably a slamdunk GDPR lawsuit waiting to happen, and (2) apparently the returned token is still replayable - Anti Captcha claims to support v3, you can even select what score you want to have (>= 0.3/0.7/0.9) lol

for recaptcha it's even simpler. Because of how it's implemented, all you have to do is send the captcha solving service the site key, and it returns a solved token.