Why would these types of people want all their data available on a public chain?
As an example, they may have their public photos in IPFS, served from their server (or shared pointers), but will have ownership rights of those photos on chain.
That is different than Instagram where Facebook owns the images.
They cannot be deplatformed which is valuable. The question is whether it’s value exceeds the value of Instagram distribution.
The photos are valuable only to the photographer, who has the right to license it to Getty and others.