I still don't know whether you're supposed to hit those and I also don't know if it's normal to get two challenges or if that just means I did the first one wrong.
It doesn't really matter, they don't expect you to get everything right on these. While most of the time you need to get mostly right (Google is using these to train their AI so often they are not sure themselves), they are also looking at other things, like how you move your mouse, and the cookies that they use to spy on people to determine the probability of you being a human. If you pass a certain threshold they let you through, and you can do it even if you miss a square.
and the cookies that they use to spy on people to determine the probability of you being a human
which is why I assume, as a VPN user who rejects as many cookies as possible, I constantly have to do 5-6 fucking captchas in a row, sometimes more, before it'll let me through.. I can't be that bad at doing them lol
Is it frustrating? Fuck yeah. Will it get me to change my behaviour and drop those measures so that the companies getting in my way can collect more of my data? Fuck no.
It has to be more sophisticated than that. Otherwise users could easily taint the datasets by giving wrong answers on purpose.
It probably checks your answer against the current model's best guess and if it's close enough, you get a pass and your input is added to the training data for the next iteration. The more wrong you are, the more challenges you get.
I vaguely remember 4chan figuring out something to do with which was the control and which the variable and deciding to spam solving the control correctly but the variable with some kind of nonsense (knowing 4chan probably a slur) until the system got enough confirmation that it got moved to the control group and would accept I it there
Oh I usually get the green checkmark without any captcha.
It depends on the website you are visiting, whether you are loged in on Google and how much cookies you allow and a lot more. Also using Chrome may help because it collects more data.