I have to agree that I think it's unethical to stake someone else's coins. But on a technical level, there's nothing I can do to stop it, not with this coin, or any other coin. As far as the network is concerned, all wallets are created equal, and if people don't like what he's doing they don't have to mine from his pool.
With that said, his pool isn't even listed as an official pool anymore, by his own request. I highly encourage people to mine at the other fantastic pools I have listed in the OP. They are all confirmed up to date and also very reputable, well regarded pools. Heck, Suchpool had a pool up for us almost immediately after launch, and there was no announcement or warning.
https://www.suchpool.pw/gen/https://www.ipominer.com/http://gen.binpool.comAs for suprnova, Genstake is not listed on the main site, not listed in the op, and he tweeted about it once, at launch, and that's it. And yet there's 25 pool workers there. People have chosen to use that pool, and that's fine. It's a free world. One thing I can say is that he's only got a quarter of the hash on the network at his pool, so other people are mining elsewhere. Maybe they're solo mining. Maybe there's even be a private pool going. I don't know.
One thing I can tell you is that competition is going to beef up a bit after block 10000 when the POW block rewards increase 5x. I'm interested to see how things go after that.