The point about systems like anarcho-syndicalism is to avoid the scaling problem by... NOT scaling.
Why do we need to scale ? What's the purpose ? What value does it have ? Why do we need countries ?What does having a COUNTRY offer you that having a town doesn't ?
In an Anarchism where everybody votes on every law and you get more votes the more you are personally affected by the law (to prevent tyranny of the majority) - the ideal scenario is that the area covered by the law be only your immediate environment.
Not even a whole city. There is absolutely no logical reason to assume that good laws for Brooklyn will ALSO be good laws for Manhattan or Queens. As long as they can agree on some common principles for trading between them - why can't people in Brooklyn vote to allow something that people in Queens oppose ?
In this system the way you enforce a true sharing of resources without hardship or leaving people out is not by force OR incentive, it's simply by giving everybody a truly equal voice in their own governance. That will regulate the market, it will set a decent minimum wage (because the minimum wage earners outnumber the businesses) - so that wallmart can't pay people so badly that all their employees still get foodstamps (which just means they've shifted their labour bill onto the taxpayers - that is not a good thing and makes all the supposed "savings" they offer completely nullified - you're paying the same price just through the very inefficient middleman of the government). It will make laws against dumping toxins in the drinking water because the people who drink that water are making the laws and if you BREAK that law owning a business will sure as hell NOT keep you out of prison because the people who decide the punishment for the law are the SAME people whom you poisoned.
Communism has had a split between anarchists and statists right from the start. Hell Marx himself got into fistfights with anarchists at the 1st International. Right from the start a lot of the most important thinkers believed that communism requires the ABSENCE of government rather than it's maximization.
Unfortunately - the statists won out in the early days (and the anarchists never joined them - through the years the anarcho communists would frequently be simultaneous at war with invaders BOTH capitalist AND communist wanting to destroy them).
The most successful of those was Andalusia, which created an anarcho-socialist system in their city in the early 20th century, and managed to run it with a fairly high degree of success (it wasn't problem free and their implementation had some flaws - which people since have learned from but it was pretty good). Orwell himself described it as the happiest and most free society he ever got to visit - and praised how truly egalitarian they were - a city with no poverty or hunger or suffering at all).
They were still economically strong when they fell - despite having been at war the entire 20 years of their existence (state-communists from the South and capitalists from the north both wanted to destroy them) until World War 2 - the scale up of military power finally forced them to surrender.
The thing is - hardly anybody in academia or among (at least the educated part of) the left actually pushes for state-communism anymore, we saw what happened in the Soviet Union as well. The anarchists may have lost the original political battle for communism's soul but they were the winners in the long run because, today, they are the only ones left.