EA use a variant of this for their FIFA app and it was legitimately the most frustrating CAPTCHA I've ever tried to solve. They overlaid several objects at the same time in an attempt to make it harder and it took me 9 minutes to solve them all. Example: https://imgur.com/a/x8x4amL
This is definitely easier. While I don't mind reCAPTCHA on many resources, commercial entities which charge money for you to use their products, should try to make the login process as easy as possible and reCAPTCHA isn't one of them, as at times you have to iterate several times of identifying all cross walks or store fronts.
I'm more worried about the small state space. Even if there are many possible images, randomly guessing lets in 1/8 of the bots. Is there something to protect against this?
you can test it by trying to create a new account
its dead simple and looks to be pretty secure
you have to orient an object so that its not upside down
https://octocaptcha.com