He probably has. I would join every competitor and alternative I could find. When I was a Buyer for a chain of bike shops I made sure I shopped at every bike shop in the area. Anything less is extremely stupid. Based on his recent history, he's probably not here, but he should be.
If he's not already here under a different username.
I wouldn't do anything. Let him be, because I don't slander people I don't like or disagree with, I forgive but I don't forget. I'd rather not fall to his level.
Big tech will launch platforms trying to do exactly that if it becomes popular enough.
They won't own it but it will be like Google search, pretty much a default for the majority of zombies who don't care that it's big tech behind it.
Put a Instagram login on it and one click invite to all Instagram and WhatsApp users and you suddenly have millions of active users.
Then you continue to monitor what's being discussed, train some AI on the data that people are providing for you free of charge, and then sell the AI service back to people for a fixed price per month.
He seems so obsessed with how people receive him that he's probably already here somewhere to keep tabs on it. At the very least I like to imagine him paying some assistant to do such for him.
He is more of a 'keep your nose up and your subordinates under your feet' type of person (seems like it anyways), so he will not come here. Unless it is a PR stunt, then he'll get laughed back to reddit.
I'm gonna take him to a nice, high-fancy, highfalutin restaurant, and I'm gonna buy him things, wine and dine him. And we're gonna find some things that we have in common, and they're gonna become inside jokes to us. And then, we're just gonna laugh about them in the taxi all the way to his house, where I'm gonna fսck him in the ass.