> by making sure that compatibility is enshrined into law, so that competition occurs, rather than walled gardens

Compatibility isn't the problem. CCTV is pretty much an open standard. Folks are choosing Ring and Nest over open systems.

CCTV is a different market that requires a bunch of setup rather than merely being plug and play consumer electronics. The compatibility there is good for that market. The compatibility there in the context of Ring/Nest is irrelevant.

Compatibility in terms of the Ring/Nest ecosystem would be the separation out as separate product categories, and prohibition against anti-competitive bundling of these four aspects: hardware device, backend storage service, client app (mobile/weapp) that interacts with both, and any background "application"" functionality (image recognition, sharing with neighbors/police, etc).

If Google or Amazon released a product in each of these categories that's probably fine, as long as each were only built with documentation publicly available to every other developer. The point is if Amazon storage + Amazon social features were still wildly popular-by-default leading to this type of commercial, people could easily switch to alternatives that respected privacy.