Don't even need twitter to hear about Elon tweets. It is kind of weird though someone would spend 40 billion to have 'free' speech. Dude could spend that much on a hologram the size of the moon except it's his face and he talks all day.
It's not the tech or free speech he's buying. He's buying a market or, community, comprised of millions of people. That's most likely why he wants to know if those are people or bot accounts. People are worth more. Bots are a ripoff.