It seems fake acc/cheat is everywhere we go, solve it by using Recaptcha?

Question

I recently joined sololearn and within minutes I saw the words "Fake accounts", why not add a simple Recaptcha protection and say goodbye to automated "crime" so to speak :)

Answer 1

but then we'll need to place captcha everywhere: Q/A, challenges, comments, etc.
not effective.

Answer 2

user can login and then let bots do their stuff.
or attach neural network to a bot (not sure about effectiveness of this variant, but that's possible)

Answer 3

I dont think that is necesarry, as long as the login has Recaptcha, the automated software cant login, thus making it impossible for the software to upvote or anything else ;)

Answer 4

true, i did not think this far, thank you for the replies. ;)