Not hard to. Go look at the wide variety of hardware that does NOT work with Home Assistant, or works tenuously through some heavily rate limited public web api.

There is a reason why for my IoT setup so far, its been primarily OpenGarage, IKEA IoT (ZigBee), and existing compute services I locally host.

Remote servers come and go. Companies come and go. If I am at the forced behest of some company to 'bless' my hardware, its not mine. And I think its fraud to even claim it a sale. Its a 'rental as long as the company wishes'.