How in the world does this necessitate a subscription? All of these things can work without centralization, setup once, and contained entirely within the home.
> How in the world does this necessitate a subscription?
I can only speculate.
But, there is demand to improve sleep quality. The provider wants to charge a monthly fee for that.
The market simply puts buys and sellers together. People making business decisions will stick with Econ 101--charge what the market will bare, and why shouldn't they?