By that logic, we should ban the internet altogether, and thus create more jobs for postal workers.

No, that's incorrect.

So we should have worse, more expensive internet instead, to keep people in positions that aren't necessary? That seems like a terrible idea. Presumably a Labour Manifesto with this policy in it, would also include a bunch of provisions for unemployed people.

Presumably taxing people more to support them? I don't have a dog in this fight. But probably wise not to infer there aren't negative consequences if all bar one broadband companies get shuttered in a country.

I would gladly vote for paying all employees of all ISPs their current salary from taxes for a while, if it meant free, nationalized fast fiber in every home.

Creates more jobs, spreads knowledge, enables entertainment, connects the world. I'd say it's a great investment anywhere for society.