TBQH if small companies cannot host user data that is good too. It should be very difficult for companies of any size to house data they are not willing to defend legally.
We just disagree here. We know who can and who can't defend things legally. On a personal level, I don't like my options further reduced for who I can willingly give my data to. Legislate and determine what constitutes private data, data misuse, and/or surreptitious gathering if you want, but non-private information freely and consentually given should want to be freely proliferated.
In the short term it might result in less variety, but only until the tech proliferated and reached maturity. Then services could simply spin up on top of the data that you already host yourself. So you would have to take on the responsibility of finding a good way to host the data you want available (probably from your phone), but after that you would be able to use any service willing to operate on your data, but your data would be in public standards, not proprietary storage inside a facebook/google/amazon data center.