Re: GitHub is shitty, why not a decentralized solution?

This all ties back to checking if nodes really have the data stored, this is the easy part as calling and checking if the data is stored, the question is which way are you going to go about it? The most efficient is through the use of a committee.

I just thought maybe we do not need to store the data spreading it across the network. Maybe it will work better if you allow users to decide about what projects/repos they want to host. Like it is done in bittorrent protocol.

So if I want to protect some project from censorship I could host exactly this project's repo only.

Very good point. It encourages me to think more about an incentive mechanism.

Incentive could be created with a reward for providing disk space and bandwith. Btw I don't like the approach where people can decide what to host. This would probably end in another kind of censorship and centralizing.
If data is encrypted and fragmented, disk space/bandwith providers would not know, which data they are actually hosting/sharing.