The daft thing is there are plenty of alternative names they could have taken, that are genuinely idle accounts, and arguably better names:
sussexroyals (there are two of them after all) thesussexroyals (more grammatically correct) thesussexes (as they are commonly referred to in the press) harryandmeghan (has only posted once since Dec 2017) meghanandharry (ladies first!)
and so on...