But… he literally isn’t. Like just look at twitter, he has ruined it from day one with bad decisions day after day whose impacts haven’t shown directly, but now appear more and more with embarrassing effects (The verification badge which is now worthless and has been used to impersonate people and cooperations, the two factor authentification which stopped working, the self-DDOSing, the maximum amounts of tweets one could view per day, the old tweets that got deleted due to a glitch, etc.)
And in other companies it’s mostly other people managing the stuff and cleaning up the mess he leaves; especially SpaceX is currently just glad that he isn’t too busy with his X playtoy to bother them.
The only thing you may call him somewhat successful in is making out companies that have a potential so he could get into them early and claim their success.