Yes indeed reporting to Github takes a long time, recently I also received a message after reporting a fake github account and they said they were experiencing a high volume of complaints so it took a long time.
For me it really doesn't matter the most important thing is to report and hope it will be faster when more people report.
I know and it dosnt matter how long it takes to take the Fake Github Accounts down as long they doing it and it just takes a few minutes for reporting them.
So all good on that and i just can say when ever there is a new Fake Github Account its worth to report it on Github.
Would be nice if more Users from the Forum will be doing it , as i dont know how many this already doing it but i guess there are not much.