I use HomeKit so this probably doesn’t directly affect me at all. But if I stop using HomeKit, I can and will do as I see fit to make the gear I already own work with whatever I’ve switched to. If adversarial companies want to stop people from doing that, then I’ll help them in that mission by not bringing their stuff into my house in the first place.
See also previous discussion on >>39044932
However, the app to control them cannot work without a connection to the server. It has no local device functions at all. It won't even launch if their servers are offline.
That's just next-level stupid to me. Why build in a useless option? If Bluetooth won't work without a server connection anyway, what's the point?
For smaller non-appliance stuff there's CloudFree [1] which sells products from other vendors that can be reflashed with ESPHome (no affiliation, just a happy customer).
[0] https://www.silabs.com/wireless/z-wave/500-series-modules
A Chinese appliance maker with a German sounding name already sounds a bit dodgy in my books. But...I don't think most of us are the target, they go purely at the value buyer market.