That's the thing, his ego is super fragile, but his narcissism isn't.
According to some people who has worked with him, he's literally the type of person that comes into work some days and and he just has to fire someone no matter what and for literally no other reason than to make himself feel powerful.
x.com was the bank thing Musk created in the nineties but later sold. It became PayPal and they took the domain with them when Musk left. He bought it back in 2017 but had no actual plans for it then