There are other captcha alternatives like Turnstile, for example Private Captcha, Altcha etc. - they are owned by mostly “small” independent companies, they are not visual captchas (proof-of-work based) and very accesssible.
I remembered $30 from some comment I read, but didn't look for it later. If it was yours, thank you! (def. thank you for the Wallmart link! - would you like a credit in the blogpost like a quote?
Have you seen Private Captcha? It's main point is privacy and GDPR compliance (while being self-hosted). It's a more modern PoW captcha without the limits of Altcha (mCaptcha is mostly out of equation at this point).