Don't worry, I wouldn't ban you for this.
Yes, the physical modulation implemented by LoRa transceivers is proprietary.
It is not entirely correct to say that the "mesh" itself is proprietary. Meshtastic is open source, even if it relies on proprietary radio hardware. In principle, one could take the Meshtastic codebase and adapt it to a different physical layer.
It is perfectly reasonable to reject a technology because the full stack is not open. That said, once you look closely at most modern digital and RF hardware, you are extremely likely to encounter proprietary ICs, firmware, or physical layer implementations somewhere in the stack.
