A service that's easily defeated by automation and thus mostly devoid of value outside of training Google's AI products. I think the technical term is "false sense of security".
Sorry, I should've just left it at trivially defeated. My preferred method is to just use a different browser and/or clear my cookies. Meanwhile I spent around 30 seconds on DDG and came up with 5 chrome store captcha solvers, 2 github projects, and 1 paid captcha solving service.
Right, it's not even good at anything save for using my CPU and my time to train Google's AI products. As a human if I get blocked (a.k.a. it refuses to acknowledge anything I've "solved" correctly) I can clear my cookies and bypass the block. Whatever benefit you think you're getting, you're not.
The benefit I'm getting is it stop almost all bots from submitting forms on my websites. It works basically flawlessly for that. I'm guessing you either don't run any websites with traffic or have never tried it if you think its worthless. I'm sure there are ways to bypass them but no one I care about has bothered so it doesn't matter. The lock on my front door doesn't have to stop a professional lock picker to be useful. The captcha on my website doesn't have to stop someone trying to get around it for it to be useful at stopping almost all the bots that don't even bother trying.