In the time that I’ve been using it, they’ve experimented with adding loans for placing market bets, added the ability to resolve a market with a probability (vs. YES/NO), and began allowing users to donate their funds to selected charities. Since the market creator has total power to decide the resolution, betting on these “sure” markets is essentially a bet on (1) the reputation of the market creator, and (2) that the market creator will actually resolve the market at all. Experimenting with market creation: Recently, Manifold added a feature that allows you to create a market “for free” – they front a small amount of liquidity to get the market started.