Comment by um_ya

There is no such thing as a trustless app, unless you are doing basic mathematical algorithms contained within the same system. Ethereum adds no value to Bitcoin because any useful apps you want to make NEED a centralize source to provide data to it. For example, if I want to make an app that sends coins to someone when bitcoin is at a certain price, I would inherently be relying on the trusted source, that provides the bitcoin price data. Similarly for sport payouts or property contracts, they all rely on the external centralized source for information. The only thing Ethereum can do, is basic operations contingent on values within the same system, otherwise you break the "trustless apps" veil.