That's not a value proposition. That's more of a definition :-P
I'm thinking things along the lines of privacy, security, speed, etc
Lots of reasons to self host things for this privacy is a big one but owning a service instead of renting means you don’t need to worry about the landlord or service provider raising prices or kicking you out.
SnapDrop/PairDrop is famous for going offline sometimes. It happened to me once.