Surely there are trivial ways for them to detect when a name changes drastically (ie. not just the surname), or when the biometric features of the new profile photo don’t match the old one?

They could even extend their biometric capabilities could even step into the ‘slightly unethical’ realm, by perhaps detecting a flirtatious message from a profile with a cute Japanese girl, via somewhere in Northern Africa. Even just putting basic controls around messages from complete strangers.