Network equipment riding on balloons, airships, gliders and planes could boost internet access, including in disaster zones, and improve scientific monitoring.
Unless your population is incredibly sparse, land fiber or adsl cables are the way to go.
I live in a region which have 25 hab/km^2 which is one of the lowest in the world. And we have a massive cable implementation that covers more than 95% of the population.
The problem is money. And if you don't have money for cable you don't have money for XVIII century internet carrying blimps.
Land cables are not that expensive but they are in charge of the State, things like balloons or Starlink are the charge of the user and the company, the State doesn't get the money but doesn't need to build infrastructures