Agreed, it makes no business sense to store all your core business data in a cloud that you have so little control over and which pretty much any Google or Fire

Agreed, it makes no business sense to store all your core business data in a cloud that you have so little control over and which pretty much any Google or Firebase employee can browse at will. You're putting yourself completely at the mercy of the service provider (fully exposed) without any leverage when it comes to bargaining. It's like renting office space from a landlord who owns all the office buildings in town - You're completely at their mercy because you have no alternatives. Eventually, they will squeeze all the profits out of you because they can. Anyone who understands human nature can see what's going to happen in 10 years or so.