I expect more of these Ethereum forks soon after the next coming upgrade in August, it now depends on how strong the community and the developers are. So far there has not been any Ethereum forks that has been able to give Ethereum run for its money and I expect this to continue but as long as people will get free money from these forks, I do expect people to rally around them.
So for Puslechain is just one of the Ethereum forks with no usecase