I imagine that one day we will all have a personal sub blockchain. Encrypted but being able to hand out keys for access to certain private information. Ie Medical recored, financial detail, favourite colour etc. Creating an immutable identity under your complete control. This would be the new oil that can be monitised by the individual.

I try to be careful what I post to the Internet in general. How many time have we seen famous people being cancelled because they typed something years ago that comes back to haunt then. Blockchain gets rid of the excuse that some time travelling hackers went back and typed that. This was something that some news ancor claimed.