Pretending that Zcash doesn’t have the best and only yet-seen practical way to apply ZKP here is a disingenuous argument.  Especially since I want to copy their open-source technology—research and development of which was paid for by their “dev tax”.  (Thanks.)

There does not exist any other decentralized privacy solution that reveals zero information.  In one of the posts that you said you did not bother to read, I explained why.

All other existing privacy solutions either are copies of Zcash, or are centralized (with blind signatures, as Digicash), or rely on decoy obfuscation of leaked information to try to cover up the trail of transactions (Monero mixins).  (Or are ridiculous outright scams, such DASH.  Or rely on trusted hardware enclaves, like some new shitcoins—literally “Intel inside!”)  Monero (or Blockstream’s Liquid) technically use “zero-knowledge proofs” to keep transaction amounts confidential, but they are not overall “zero-knowledge”.  Your claim that “ZKP has been used forever and it is essential to any privacy algorithm” is hypertechnical hairsplitting to avoid an obvious point.