With federated platforms like Mastodon, PeerTube, PixelFed, you technically can network with 3 billion people, despite the lack of the central server.

Ads and heavy websites are slow and expensive to browse for half of human population due to poor connectivity.

That's entertainment or otherwise nonessential, no?

Some of the best parts of the internet are already free despite the option to monetize them with ads (e.g. wikipedia), if ads weren't an option, I think you would see many more spaces like that popping up.

It's cheap enough to run a server that people frequently do so without expecting compensation. Not everything needs to be paid.

Open street map and wikipedia runs of of donations/free labor so I don't think poor people would be kicked of those. Google would presumably come with your internet subscription, so that would be factored in for most libraries where the poor would access the internet.