He could have just done nothing with the company, hired someone to put in charge and say "you have a year to make Twitter profitable", and when that inevitably fails shut it down.

He didn't have to tank his reputation. All the time he's spending running Twitter into the ground he could have instead done nothing, and still shut it down in the same time frame for being "not-profitable". Enough time would have passed for him to get away with it, and would have lost less money in the process.

So even if his plan is to destroy Twitter, he's still an idiot doing it in the dumbest way possible.