Just so we talk about the same thing... Cloudron has an internal network 172.18.0.0/16 . These IPs never leave the server. It's only a problem if your own internal network is also using these IPs. Is that the case? Generally, the docker stack uses 172.17 or 172.18 and the private networks use 192.168 (home) or 10.0 (enterprise). Very broad generalization yes.
I do know that the train network here (DB) uses 172 and it conflicts with Cloudron's network... It's kind of annoying when connecting to their wifi.