https://www.theverge.com/2019/1/11/18177734/ces-2019-apple-homekit-tv-sony-lg-vizio-lights-locks

Apple made a critical change to HomeKit two years ago. It started allowing products to join its smart home ecosystem just by adding some code, instead of requiring them to build in a special-purpose chip.

The effects of that change have been slow to appear, but we’re finally starting to see them. The result is a lot more HomeKit products since it’s now far easier for companies to build support into new products, and old products can be updated to add support, too.