It seems like some pools are doing some testing on testnet3, and given that testnet4 is being hijacked by that same asshole who is abusing the rules of testnet4, they just didn't bother to compete with him and overthrow them.
Which makes you wonder -- do these guys even know how to code shit? If yes, what stops them from taking testnet4? They don't want to fight evil with evil?
Good question.
The current 'leader' is
Terra Pool which has 1.82EH behind them per the website (
if you dig deep enough). Odd thing is - all Google searches come up with then being an altcoin validator pool - LUNA it be exact.
So why the F is one or more of there users pointing hash rate at the testnet? I do see that most of their block contain tx's so as you said, maybe someone is using pooled resources to actually (and very quickly) test code?