I work on mesh wifi, so I'm familiar with Freenet. You can see their (admittedly quite awesome) footprint here:
https://cloudtrax.com/overview2.php?id=freenet_production
Of particular interest is that the mesh admin tool / firmware they're using, which is based on OpenWRT, actually underreports the number of clients and traffic because of its size. The operators say the real figures are order(s) of magnitude larger.