The worst thing to happen to home automation was companies trying to lock customers into their ecosystem without greater interoperability.
Lately I've been fighting with things like iOS, Chromecast, "smart" lightbulbs, vacuum robots and smartwatches and all of these go out of their way to lock these down and force their shitty and buggy and probably illegal spyware on me.
I'm honestly asking why this is the default. What do the companies have to lose in people making their products suck less?
I'd guess it's part just some knee-jerk business ideology and attempts at vendor lock-in and SaaS scams. Lock-in is clearly anticompetitive, and probably illegal, but law enforcement cares more about people smoking weed etc.
The upcoming EU data act seems to try to tackle some of these. But I have very little hope it will amount to much. EU doesn't regulate business, business regulates EU.