You are right, one need a minimum level of education to take part of these grassroot projects. A mobile phone is helpful, even when one have no internet connection.
But these communities can work together. Each community can have its own currency. They can trade their coins. Even better, the bancor protocol can do it for them via smart contracts. So when you have I.e. a banana coin, you can pay with it and get either coffee coins or, even better, coffee, from the coffee community.
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