I see all altcoins dumping 90% more at least and perhaps then we will find out who was milking them for profits in 2019 and who was actually working and has a decent product with a future.
Well that's for sure.
But knowing who's milking the profits? I don't think that someone will show himself in the front of the crowd will tell that he has earned that much with these. Some can claim that they've made enough money but not with those but with bitcoin.