Wikipedia was a natural monopoly. More and more people are dropping it, especially when it comes to anything even slightly political. Everyone knows that it's completely worthless when it comes to politics, history, or anything tangentially related to a Current Year issue.

At this point, the entire site is being propped up by a very small group of leftist zealots who desperately need to control the narrative (or else they don't get paid by their super PAC). Anyone even remotely right of Pol Pot has fled and is looking for a place to go.

The problem with the sites you mentioned is that they started too early and they're too similar to Wikipedia itself. They're doomed to the same fate. A real replacement needs tighter controls over who can edit and checks and balances to prevent a handful of troons from taking the entire thing over and turning it into yet another branch of the DNC.