It's a standard clause for most apps. If a breach of the terms of conditions (such as using it for commercial purposes, like selling the software), they are allowed to launch an investigation. No where does this mention "spying" on modifying the app for such use.
Maybe the app is already modified for such use and just needs to be given a "start spying" command.
Maybe, personally I don't trust closed source apps like these for that reason.
And when I do try them, it's with Little Snitch blocking outgoing connections.
Sorry I haven’t used this product yet - Do the chat messages get uploaded to a server ?