It also reinforces the point that the only reason there are folks hitting the testnet so hard is because:
A. They can
B. They enjoy screwing with testnet and breaking what it is intended to be used for
C. There sad to say, is a market for selling tBTC to idjits
Heavens forbid that they make a Faucet to distribute their coins for free to developers that actually need it and can't mine it themselves because of these attacks...

OP's post refers to testnet3 (not even testnet4), which is even worse since it has a lot less value anyway. 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?