I was wondering why he bought twitter, why he didn't just create a new social platform like that. It's not difficult even for a businessman to do it, but maybe because Twitter is in great demand by all circles.
Twitter is the biggest and popular social network platform, they didn’t gain such huge popularity at overnight, almost 16 years ago it’s founded. So i think it’s of course pretty difficult to just create a new social platform then will go popular very shortly. As far as I've heard, he will turn it into a private company and the most interesting thing is he buys it to protect freedom of speech.
Twitter is not the biggest social network platform if you compare it with Facebook or Youtube. But, it is the platform where you will find the most influential and powerful people on earth. He invested because it is better to buy an existing platform than to create one and promote it. He did invest in the Signal app to rival WhatsApp and Telegram so far it is nowhere near to them. That is why he bought Twitter and through it, he would control many things.