Using a fly.io free tier
https://noted.lol/easy-off-site-monitoring-with-fly-io-and-uptime-kuma/
it wasn't a criticism of your project, it's just a layer of security for these companies. you asked for a raise and they apparently responded promptly.
In general everyone should use 1-2 servers, 10 is not exactly a low number. Even in the most boring players like AWS, using 1 month and paying the bill will already give you higher limits.
use installed on edgerouter-x, no problem, efficient and functional