TL;DR: According to Twitter... erm, X, accounts are their property and they don't have to allow the transfer of accounts. That's it, that's the whole argument.

TL;DR: According to Twitter... erm, X, accounts are their property and they don't have to allow the transfer of accounts. That's it, that's the whole argument. There is not stated reason why X should care. And it's not like any time a company has been bought or sold before that they have jumped in and say "nuh-uh".