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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.
One of my favorites these days is APS Physics's captcha: they present 8 random images and say "which of these is a portrait of Marie Curie or Einstein?" Very specific, very niche. But kinda funny and probably quite effective.
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