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I am very sad at how ineffective reCAPTCHA is at preventing spam bots. Either spammers have developed a well-oiled human-based pipeline for breaking captchas for <<$0.1 each, or they've made a DL-based captcha breaker. In any case, it's free-for-all these days.
For a long time my go-to spam prevention solution was invisible fields like "username", "password" in the registration form -- if you fill them in, you must be a bot. It used to be very effective, but increasingly less so recently, probably because bots are now browser-based.
Now I'm using ad-hoc questions visible to users. Trivial to break if a human were to write a script specific to my forms, but that's not part of my threat profile.
In addition, I checked a box confirming I am a human... and got a response message telling me I was incorrect! 
The current version of reCAPTCHA can be easily bypassed using Speech to Text, see https://github.com/ecthros/uncaptcha2 …
https://github.com/ecthros/uncaptcha … 1) switch to audio 2) use speech recognition to solve 3) ???? 4) Profit! or Abuse!
Spammers have definitely made more headway in breaking Recaptcha. If Uncaptcha 2, can break it with 91% accuracy, how farther do you think spammers will go? https://github.com/ecthros/uncaptcha2 …
... and the user experience for *humans* using reCAPTCHA is getting worse and worse. Went from taking <5 secs to frequently taking >30 secs.
There is an article explaining how captchas are using us to label training data for self driving cars. Dont fully understand it because I've tried just clicking random junk and it doesnt let me pass. I'm sure it has a few times though.
Relevant: https://xkcd.com/810/
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