Community-owned does not necessarily mean govt owned: look at peer-to-peer mesh networks (https://hyperboria.net/). Private citizens run their own nodes and connect to the nodes near them (and potentially help their neighbours by hooking them up and so on). The community members literally own the infrastructure; not through the abstraction of government.

They have incentive to keep things running well and efficiently because well it's you and your friends and neighbours!

The community-owned options are only considered cheap and fast because they're being compared to monopoly or near-monopoly ISPs, which can get away with inflated prices and poor service because they have no competition.

And while it's true that government bureaucracies tend to drift toward inefficiency, private monopolies are very similar. Comcast is basically so bad that they're unfixable.