reCAPTCHA always helps Google / Alphabet
Websites might benefit from these humans-only barriers but the main beneficiary is and always has been Google.
The first iterations of reCAPTCHA used humans to correct OCR errors in scanned books. Now they're using humans to fix / train systems to recognize real world objects like signs, store fronts, buses, bicycles etc.
I assume somewhere in Google-land, they are trying to make every single signpost & crossing and produce AI that recognizes other traffic to perfect the simulacrum that is their self-driving effort.