Well the problem with that is many people use the cameras for security also. So if a bad actor comes and takes the camera with them/breaks it, there would be no way for the users to get access to the footage after the fact to know what happened.
If someone manages to steal one of my cameras I'll have some close-up, HD video of them stored on my hard drive.
Want to store it in some proprietary cloud? That's fine, but it should only be done as an afterthought. SFTP, CIFS, and WebDAV would enable any power user to build and use their own home storage or cloud storage.
Otherwise, you are not materially different from Ring or Google.