IDK but recapatch hasn't worked for me on desktop. Since like... forever.
What happens is... I click the squares that contains the stairs. Or motorcycles, traffic lights, buses, w/e. Try to guess whether a sq counts if there are like 2 pixels of railing. Is railing part of the stairs? IDK. Doesn't matter tho. Google rejects anything I try and displays another captcha. Same result with that one. Fucking endlessly. It will NEVER let me past. I've tried some dozens in a row.
I think that is because G can't ID me to a particular human. So it does not matter how I answer them. "You shall not pass." G had a patent on "endless rejection" techniques. Instead of an outright block, it presents you with infinite unsolvable captchas.
Someone once analyzed web based recapatcha. Their conclusion was, G isn't trying to figure out whether you are human. It's trying to figure out WHICH human you are. It's identity resolution, not bot detection. If it can't get a high enough confidence estimate, you get denied. Sometimes with infinite captchas.
Yay. Let's make this asshole company the gatekeeper to the fucking internet.