Where does fly.io document their per-account services limits? For example, max apps, databases, etc.

I took a quick look and couldn't find them. Do they have any documented service limits?

A google search turned up [0] which does not inspire optimism.

> ...there isn’t a limit to number of apps from a billing standpoint...

[0] https://community.fly.io/t/free-tier-limits-and-quota-needs-...