Earlier quoted context omitted.
I mean, as soon as synchronisation is required in any system, block chain, distributed SAAS, even Peer to Peer sharing, decentralisation fails hard That's one of the sticking points I have with the /idea/ of the technology
Ethereum and similar chains run arbitrary computation on-chain. You can make a futures exchange on Ethereum (or Solana, etc). However, the fees for doing so are very large, and confirmation times are very long, like any other on-chain transaction.
> confirmation times are very long, like any other on-chain transaction
Yes. synchronisation is where everything breaks down because you have to get everyone to agree to the new state.
edit: Sorry, not everyone, but a consensus, and that consensus is then what everyone agrees is the state.