A captcha-solver as a service.

The utility of captchas are contested. Even for the reCaptcha v3:

reCAPTCHA v3 has fared no better. In 2019, researchers devised a reinforcement learning attack that breaks reCAPTCHA v3's behavior-based challenges 97 percent of the time.

A captcha with proof of work (~2s). This can definitely be better for every user as they do nothing. It's free software, privacy-friendly, and it doesn't use IP addresses (so users won't suffer what reCaptcha or CloudFlare impose).

They have a GitHub organization: https://github.com/mCaptcha

lol. Simply LOL.
Because a computer can easily solve this !