We at AirGradient see that very well that more and more companies force their users into the cloud and some monitors even refuse to show current air quality when not registered to the cloud. Imagine you would need to register your fever thermometer with an app in the cloud before you could measure your temperature...
Part of the problem is not only the investors in Matter but also VC funded smart home equipment manufacturers that are pressured to go down the recurring revenue business model.
At AirGradient [1] we want to demonstrate a counter example. Our fully certified air quality monitors are open source hardware and thus we provide the firmware code and they can be easily re-flashed with whatever software you like to use. With this openness a great community has emerged that maintains integrations to various systems like Home Assistant via ESPHome.