Well no, it’s not enormous, but Amazon is selling a couple million ring doorbells a year, and a couple million more of their cameras.
It’s a sufficiently large market to hop into, especially if you can make a product that’s easier to deal with from an ecosystem perspective than the incumbents, which isn’t something I’d ever bet against Apple managing to pull off.
If only they made smart switches you could use, perhaps?
100% agree that smart bulbs are incredibly stupid and you should go with a switch if you want to smartify shit.