For the tado app by Athom you’d contact homey.app/support;
For the tadoZones app by Martin you’d post into the app topic.
But the response from tado (posted by KikkerX10) basically says:
A. Without the Auto-Assist subscription: limited to 100 requests/day
A small daily quota, which should still support basic use cases that are not available via tado’s local APIs: HomeKit for V3/V3+ devices or Matter for tado° X devices.
(imho) this means local connected tado devices with Homekit / Matter are not restricted.
B. With Auto-Assist: 20.000 requests/day
This should suffice for controlling thermostat + several TRV’s + Aircons.
I mean, twenty thousand calls a day is quite a lot (= 833 calls/hr <> 13.8 calls/min). And this doesn’t include Homekit / Matter connected tado devices.
Think before you buy cloud based devices (including Homey).