You misunderstand. The analogy wouldn't be Napster with networking code disabled. The analogy is Napster on a LAN. Only those on the LAN can access it so it's not open to the world, but nonetheless you've still got a p2p file-sharing client.

And yes. I'm using the engineering definition. I don't believe in letting a gaggle of marketers and scammers define my terms. A blockchain is a specific technology. It doesn't mean 'whatever scam is happening this week', even if said scam involves a blockchain.

I don't blame you for associating blockchains with scams and fully open projects, that's undeniably what we've seen it used for. But that's not what defines a blockchain.

"A scalpel can only be used for surgery"

"If you use a scalpel to cut a steak, it's still a scalpel."

"There must be some new aspect to scalpels! We've been able to make steak knives for decades!"