Both of those are very active projects that require an embedding in community, particularly a community that is going to be around for a while.
Most left groups in the US make no attempt whatsoever to build within and among a community. Many of the seeming exceptions get rerouted into a charity pipeline. They might call it mutual aid but it tends to be structured as charity with the money and labor coming from outside the community to simply provide a service for the most destitute inside the community, plus other little telltale signs. There is little work done to radicalize, incorporate, learn from the community itself, including the whole community, not just those deemed worthy of charity.
The other challenge is that communities are in transition. You try to set up shop somewhere and maybe 10 years later it's an entirely new set of people due to increased property values + increased cost of living + stagnant paychecks. To me this means you can't half-ass it, as you're going to need to create a resilient network that can move and connect across the new places people need to live and work.
But to me the main issue is that groups don't even really try in the first place. Sometimes this is even for ideological reasons.