For 20$ you can solve a few million ReCAPTCHA's using Buster and a paid-for STT engine. Atm Buster works about 95% of the time, so you'd see significant amounts of spam even with ReCAPTCHA.
Can you please provide a few ready-to-use links?
You can pay for Azure and other STT engines to solve it for you an dthe results are usually a bit better.