It’s so obvious it’s a scam too because of how vague some of the “challenges” are. “Click all the squares that contain a bike” and then you do it in every conceivable way AND IT STILL WONT ACCEPT YOUR SUBMISSION. Stupid
I have a suspicion that it might depend on a few factors that might be related to Google’s ability to track, such as the browsers you use and whether you’re on VPN. I saw a post on Lemmy the other day (can’t remember where) that they suspect captcha is more annoying on Firefox, whereas fine with Chrominum-based browsers, esp Google Chrome. I think I sometimes experienced this as well, but I didn’t keep track.
I had one today where it was click on all the squares that contain a bus. One square very clearly contained a truck, not a bus. When I didn't select that square, it told me I was wrong.
I've always thought that CAPTCHA also checksfor time, e.g. if the correct solution is entered too fast, it will determine that you are a bot. This would mean that a fast bot would not really "win". Not sure if this is the case or why I've thought it is, but it came to my mind from this 😅
The captcha with the checkbox tracks a lots of items like mouse movement, browsing history etc. Full list is not public but they use all their spying tools on that one
When I added the contact form on my website, I wanted to add reCaptcha so it would protect me from spam emails and make it easier for people by not having to click on pictures of fire hydrants. Reading a little about the privacy concerns about reCaptcha, I dropped it all together.
I am in the EU, have a small numbers of visitors, it'a B2B thing so it was not worth it.
I've seen those puzzle piece captchas (common on crypto exchanges) that always say I completed the puzzle faster than 99% of users (even if I didn't do the puzzle particularly fast). I presume those 99% are all bots attempting to hack into crypto wallets.