From those ethereum forks, only ethereum classic can be considered as success like bitcoincash (it forked from bitcoin). For other token forks, it's just like to earn easy money purpose since those aren't active after it forked
It's really lazy to call everything a "scam" retrospectively from mid-2019...
But in 2017, Ethereum forks were hot and a LOT of money was stacked by hard working traders...
Some of these projects had talented devs and are still in active development.
UBQ was able to list tokens like DOT, APX, GEO and is still worth $5 million...
PIRL has great devs and keeps rolling out new features.
Several of these projects got crushed by the Cryptopia fraud.
Are all those PIVX forks doing better? Oh, they all went to zero. Too bad.