Building a network outward from a local web server rather than trying to hold back the ocean is a logically possible option. It's practical possibility depends on the degree of locality, the use case, and budget.
In the case of a well established local community, creating accounts based on real world identity verification may be a viable alternative to handling the problem of the internet at the network level.
Essentially, if holding back the internet matters the adversaries are well funded, automated, technically sophisticated, and legion. The best defense is probably social or network partitioning if the budget is not huge.
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Building a network outward from a local web server rather than trying to hold back the ocean is a logically possible option. It's practical possibility depends on the degree of locality, the use case, and budget.
In the case of a well established local community, creating accounts based on real world identity verification may be a viable alternative to handling the problem of the internet at the network level.
Essentially, if holding back the internet matters the adversaries are well funded, automated, technically sophisticated, and legion. The best defense is probably social or network partitioning if the budget is not huge.