Can you name a large scale anarchist project with better rights than Cuba or Vietnam?
I'll save you the effort: nah. Catalonia had concentration camps and "free" Ukraine was a bandit dictatorship that empowered kulaks to do pogroms. And they both got crushed partially due to a lack of centralization, and a lack of collaboration with and alienation from popular fronts.
"Tankies" as you put it, are the actual leftists advancing liberation, and not just jerking themselves off about how left they are, which is easy to do when their ideology remains only theoretical. When the rubber hits the road, anarchists fall somewhere between the brutality of socialist projects and capitalism.
As Trotsky said "anarchism is a rain coat that leaks only while it is wet"