When .app was launched we saw a sustained 1,000 QPS of domain registrations through the first minute. We literally are not allowed by ICANN to prevent any valid registrations, as we must treat all registrars and registrants equally. Also, how would you do such a thing anyway? How do you possibly know what is a squatter and what is a 'valid' registration when you have basically no information to work off of? And do you really want a world where some domain name registrations are arbitrarily rejected like that? Better to have the situation where if it's available, and you can pay for it, it's yours.