TLD proliferation is not great because it raises the risk of collision if ICANN decides to make the same TLD
> Therefore, we take the convention that TLDs that are known to be ICANN should be restricted to ICANN, TLDs that are known to be of alternative DNS systems should be restricted to those, and TLDs that are not known to exist anywhere should be allowed, but only from ICANN. This rule allows that the name service of a name can be determined statically.
