Hmmm that would not prevent every attemps (someone really motivated could always game the system) but at least prevent someone losing 30minutes to creates dummy

Hmmm that would not prevent every attemps (someone really motivated could always game the system) but at least prevent someone losing 30minutes to creates dummy accounts and easily obtain one of the first fames (when going with 100 000 users it will be harder). And making fake accounts all following each other can be detected easily, especially if they all join the lottery