mCaptcha, ALTCHA, Cap, Friendly Captcha, Private Captcha, Procaptcha, Anubis... there are literally dozens of open source alternatives that aren't feeding the Do Be Evil company... not to mention all of the commercial alternatives - if for whatever reason, you do feel like paying for a service that costs nothing to offer

Gen off it. Fraud detection is nontrivial and requires ongoing effort. It’s reasonable for people to be compensated for that.