Comment by baobun
This sounds somewhat backwards to me but maybe missing something... We got a bunch of Tuya devices and was barely aware they even have an app. They paired out of the box to a zigbee2mqtt gateway on the local airgapped network without fuss. No apps, online servers, api keys, vendor signature checks, or such shenanigans at all. I don't think the motion sensors we have from them have the capability to send dhcp over ip even if they wanted.
The Fingerbot also seems to operate over zigbee? Why would you need a developer account in the first place? And why would anyone but Tuya themselves want to hook into their cloud?
Sorry for the late answer. My fingerbot just talks bluetooth and can be operated via ble locally. Just like your zigbee devices. That's because they are not "Tuya devices" they are simple hardware devices that can be remote controlled via the tuya cloud if you have a local bridge.
Tuya is just the cloud connector for those devices that communicates with the bridge (so the hardware manufacturers don't need to operate their own servers).