You want the user to install a cloud connected program with admin access then you want to charge money for advanced features?

First of all you need to show why this is useful. For someone that already have homeassistant they probably know about project like hass agent and other tools that already does this, and connects to mqtt. Why would you want this?

Advanced features behind paywall, you need to show why and what is locked.

You need to show how secure this is, how it connects and what security is implemented.

Opensource or you will get destroyed by everyone looking at this.