Yes, if you buy an off the shelf solution, it’ll be expensive.
I’m suggesting treating VPS instances like you would a colo setup. Let cloud providers manage the hardware, and keep the load balancing in house. For Signal, this can be as simple as client-side latency/load checks. You can still colo in locations with heavier load; that’s how some Linux distros handle repo mirrors, and it works well. Signal’s data needs should be so low that simple DB replicas should be sufficient.
Yes, if you buy an off the shelf solution, it’ll be expensive.
I’m suggesting treating VPS instances like you would a colo setup. Let cloud providers manage the hardware, and keep the load balancing in house. For Signal, this can be as simple as client-side latency/load checks. You can still colo in locations with heavier load; that’s how some Linux distros handle repo mirrors, and it works well. Signal’s data needs should be so low that simple DB replicas should be sufficient.