I think the success really got to him. As a (cured) ex Elon fanboy who used to like him way before he was widely known to a non-nerd community, I distinctively remember this interview around the pre-Falcon 9 times with him which is like

Interviewer: Neil Armstrong says he doesn‘t want a private company like SpaceX to launch humans to tue moon because it‘s unsafe. What do you think about that?

Humble Elon, literally crying: I… I just wish he could come out here and see what we are doing.

That‘s the picture I carried with me for a long time, together with some really smart remarks about climate change on panels that were way ahead of their time.

These days, it‘s really all an ego shitshow, memes and YOLo. He definitely changed a LOT the past few years.