It is bad for universally legal uses (sharing, mirroring) because centralised alternatives are always faster and cheaper (benefiting from economies of scale).

It is bad for universally legal uses (sharing, mirroring) because centralised alternatives are always faster and cheaper (benefiting from economies of scale). It is also probably (I'm not quite sure yet) worse for the illegal uses because it is slower and more compute heavy than torrents, and there is way worse discoverability and moderation, which is important in the communities sharing illegal files. Basically any true decentralisation is an attempt to eliminate trust from the system. And there are two problems with this - 1) maybe 0.1% of all attempts are actually decentralised (other 99.9% are either self delusional or lying), and 2) trust is actually a desirable thing, especially in the important things like money or file storage.