Biometric data makes onboarding a harder hurdle with more cost but why would it stop spammers from just hiring a few hundred people? And if you ban them, how is it still a blockchain?

The thing about decentralization is that not one entity decides what goes. And unless EOS just innovated in this space with something no one can imagine right now (which is very unlikely) they will have the same problems. And EOS will be a centralized blockchain, where Dan can ban whoever he does not like.

I'm curious to see how they implemented their biometric voodoo stuff but I won't hold my breath that it is in any way revolutionary and I don't think that it will stop bots.