Wouldn't it be cool if someone used the exact same privacy tech as Zcash, but launched it without the founders tax nonsense, and made it so all transactions were private by default, so the coin was actually fungible and usable as digital cash.
Someone did!
https://bitcointalk.org/index.php?topic=4979549.0Doesn't matter, ZK-Snarks is a trusted setup and that cannot change so no matter what you do with it it is a non starter.