The original reCAPTCHA which was used to train OCR came out back when Google was at least pretending to not be evil, hence the favourable coverage about old books. Now that the challenges are used to train Waymo cars (citation needed, but obviously they won't be sharing the data), and Google is definitely not tracking everyone with it (according to... Google, the adtech company), there's no positive spin you could possibly put on it.

Were Anubis to add crypto mining, even if all the revenue went to Techaro, you could still say "the enshittification is a shame, but at least they're not Google". Using the compute for BOINC protein folding somehow should be unobjectionable.