But blockchain is not (just) about open participation. Itโs about trustlessness (โwell actuallyโ there are โpermissioned blockchainsโ but thatโs just a glorified/terrible variant of Git pretty much). And society is built on trust. As Nicholas Weaver puts it, blockchains (trustlessness) is good for one thing only: censorship resistance, i.e. evading the law. Itโs just the only option for thing like ransomware. For everything else, systems with trust are many many orders of magnitude more efficient.
And Iโd say systems without trustlessness can be โopen participationโ. Dename was a pretty cool idea.