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"The" blockchain is still "a" blockchain. There are many possible blockchain instantiations and Bitcoin is one of them.

Literally anyone can make up a Blockchain. That's why there's a convoluted mess of crypto.

Good luck getting actors to spend electricity to participate in Nakamoto consensus though

I wouldn't bother. I've got no use for crypto.

This is true in theory, but to make anything novel with any viability is a long and unclear process.

And more importantly, zero purpose other than to enrich themselves.