1.) Moses is gas lighting everyone when he says he tracks by MAC addresses, Windows license keys, et al. He doesn't.
2.) It's basically impossible to protect against hydras. If someone wants to create multiple accounts, they'll do just that. Moses could even go as far as to require a valid and verified phone number from eahc user, and even that's quite easy to circumvent as you can buy phone numbers for $0.20/month nowadays.