They are so shady about this stuff
I have a Honeywell t6 that I got when they installed a new unit - Honeywell INSISTS that you create an account and download the app to connect it to your home network
Thankfully this is bullshit and you can connect it directly from the thermostat to HomeKit - you will not find a single piece of documentation on this though and will be told it’s not possible
The real kicker is that there is a notification to register your device that you can’t get rid of unless you register your device
You can only snooze it for a couple weeks at a time
How I’d love to have one on one conversations with the evil people who approve this type of crap