You cannot play with users on the official server. You are limited to the community active on that specific private host.
To connect to a private server, you are often allowing an unverified third-party application to run on your device. There is a risk that these APK files could contain malware, adware, or code designed to harvest personal data. Users should always vet the source of the download carefully. boom beach private server
Distributing modified versions of the game's assets (art, code, and sound) constitutes copyright infringement. You cannot play with users on the official server