@controlc in essence it's no different to ipv4, other than there's more addresses, so less NAT is required. (Technically there's a lot of difference, but most of that is hidden by applications, and users don't need to care)

It's not the limitation of the IPv4 that made things centralised.

Bittorrent, IPFS, Freenet, I2P, Jabber/XMPP, IRC, FTP etc etc are all well decentralised already and work on IPv4.
It just takes people to be bothered enough about security, privacy, decentralisation and the harms of "big tech" to actually use them.

It does, however, mean that there's more choice for people to run their own servers from home, if that's what they want to do.