I think David Mondrus' idea to store research results on the blockchain, for immutability, is brilliant.

https://trive.news/ doesn't fit into the categories mentioned, except loosely as a game, but then again, we are unique in our approach.

Thank-you for the excellent OP.
This is certainly an exciting new space.
I kind of like the "wild west" feel.

Don't buy any snakeoil there, Pilgrim.
Walk away from the scam-coin and nobody gets hurt.

:-D