Perceived and REAL corruption. Particularly systematic, often legal corruption. A crony system that is gamed against the unconnected. Yeah, crony capitalism has a lot to do with the anger burning the Establishment around the world.
Technology and information have a lot to do with it too. Whereas before people largely just had to believe the official media narrative (the narrative “sea” through which we swim), now they can challenge what they are told by the information gate keepers.