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FYI: Homekit requires you to by a DRM chip from Apple to basically do a hanshake with Iphone and nothing else.

Not a good idea with OEMs, and that's why I believe they gave up the white flag now: no adoption.

They are either jump on the smart home bandwagon now, or never.

It was a hardware auth chip, not DRM and it hasn’t been required for 2 years now. Software auth went live in iOS 11.3. Apple doesn’t encourage the chip anymore and AFAIK no one uses it (except legacy devices obviously). Software auth rules the day.

Well too late now, the boat has sailed.

Most OEMs chose APP + own protocol approach

I think most major HA hardware providers support Homekit at this point, with the exception of ones that don't because of competitive reasons (Nest, maybe Ring, etc) or because of strict certification requirements (like camera streams being local, $$$).

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