Hello Jeremy,
Thank you for your message.
Does RemoteUtilities need to communicate out to a RemoteUtilities network infrastructure to be able to work?
Only when absolutely necessary, such as if you enable Internet-ID connection to connect via our hosted service (remember that you can also use your self-hosted server).
Are we able to block an url/website/ip address to prevent active connections from working?
Of course you are. But you don't have to enable Internet-ID connection in the first place.
Also, please check this knowledge base article
https://www.remoteutilities.com/support/kb/does-remote-utilities-or-ru-server-call-home/