Ratgdo doesn't go through the cloud. It's a separate board. You wire it into the opener the same way would a button, and it speaks the serial protocol that a myQ enabled button or console would use. Then it can speak MQTT over wifi.
I never paired my opener with any app nor do I have it on WiFi.
Yes, of course. As a matter of fact -- I will be using one of those solutions myself and pair it with HA.
>I never paired my opener with any app nor do I have it on WiFi.
The opener may be advertising "configure me" network (WiFi or BT) -- which (in theory, depending on how bad did they screw the security up) could allow anyone to pair their app with your opener.
I think it might be better to add it to the network but firewall it off No ingress or egress. This is just so that it no longer advertises the configuration network.
Putting it into a faraday cage should also work but I suppose the firewall way is faster
I never paired my opener with any app nor do I have it on WiFi.