As far as I know ReCAPTCHA v3 should be working, I'll let @bentael know if there's been a change.
v3 is not just "a better reCAPTCHA" and it is not replacing v2.
v3 only offers "invisible" reCAPTCHA, but even if Spam Be Gone supported that (it doesn't yet) it still wouldn't work because it passes different data.
reCAPTCHA v2 is binary - either user is a robot or not.
v3 doesn't just pass "true||false" but instead passes a score from 0.0 to 1.0 and it's up to the application to determine what score is a success. It also never shows user a challenge as it's not supposed to interrupt the user in any way.
So to sum it up: for Spam Be Gone to support v3 would mean changing the way it handles reCAPTCHA and I'm not even sure if it's a good idea. v3 is supposed to continuously chceck if user is a bot without interruptions, so it's best used for frequent user actions like posting or login, not for things like registration that happen once per user and it's not a big deal if it interrupts user with a challenge. So I'd say it'd be better for Spam Be Gone to extend its functionally to use v3 on login and posting, and leave v2 on the registration page.
That convinced me Thanks a lot.
Unfortunately I'm not a developer and do not know how to develop a plugin, but I'll highly appreciate if it's developed by anyone (NodeBB team or another mate).