There are many server lease options all over the world

It increases complexity a lot to go with a bunch of separate server leases. There’s a reason global companies use hyperscalers instead of getting VPSes in 30 or 40 different countries.

I hate the centralization as much as everyone else, but for some things it’s just not feasible to go on-prem. I do know an exception. Used to work at a company with a pretty large and widely spread out customer base (big corps on multiple continents) that had its own k8s cluster in a super secure colocation space. But our backend was always slow to some degree (in multiple cases I optimized multi-second API endpoints into 10-200ms), we used asynchronous processing for the truly slow things instead of letting the user wait for a multi-minute API request, and it just wasn’t the sort of application that you need to be super fast anyway, so the extra milliseconds of latency didn’t matter that much, whether it was 50 or 500.

But with a chat app, users want it to be fast. They expect their messages to be sent as soon as they hit the send button. It might take longer to actually reach the other people in the conversation, but it needs to be fast enough that if the user hits send and then immediately closes the app, it’s sent already. Otherwise it’s bad UX.