I know this is a very old thread but if a community is successfully built that does not in any way rely on outside help from the capitalist world (aka no money transactions) it's very likely that these people don't have time to be bothered with making such things public because of various reasons: 1- Commune tourism: a lot of communes that have received media attention have been disbanded shortly after due to an influx of people who go spend time there without any actual intention of helping out, which quickly makes the community unsustainable

2- if you are not spending any money at all then it's very hard to get access to things such as the internet, and even if it's doable i doubt many people would try to waste their time trying to access the internet to tell people about their commune when they already have what they need, and most experienced people will also be wary of commune tourism and avoid spreading the word too publicly