What is especially interesting is that this will allow Google to track you on more pages, but that in this case, you can by definition not block the tracker. I've checked, but reCAPTCHA just falls under the general Google Terms of Service.
I don't believe this to be done with that goal, but it is an unfortunate side-effect.
ReCaptcha is like Cloudflare's free DDoS protection: we like to point at these services and complain how people are "ruining the web" by using them because that's what we do on HN. We ignore the big picture and whine.
But I encourage everyone to consider a darker reality: that centralized services by large companies are becoming more and more necessary in a world where it's becoming easier and easier to be an attacker. The internet is kinda broken. Like how half the ISPs in the world don't filter their egress for spoofed IPs because there's no real incentive. That every networked device in every household could unknowingly be part of a botnet because we aren't billed for externalities.
Yeah, maybe it's kinda spooky that now ReCaptcha v3 wants to be loaded on every page. But is that really the take-away? What about the fact that this is what's necessary to detect the next generation of attacker? That you can either use Google's omniscient neural-network to dynamically identify abuse or you can, what? Roll your own? What exactly is the alternative?
Do HNers think this stuff is a non-issue because nobody has every attacked their Jekyll blog hosted on Github Pages (btw, another free service by a large company)?
That is exactly what I was trying to say with the final line in my comment: I do believe that this is necessary; it's just unfortunate that it comes with the tracking side-effect.
So no: the take-away is that this improves reCAPTCHA. A side remark to that is that it also improves Google's ability to track you, and hampers your ability to fight that.
I don't believe this to be done with that goal, but it is an unfortunate side-effect.