Just realize that privacy is something governments are very very against, and people are not that much in love to keep it going. At some point, in many nations bitcoin wasn't allowed neither but we kept it going, whereas in the privacy world when governments said no, many people said who cares. Which means that between governments being against it, and people are not showing support for it, there won't be that many people who will invest into such a thing at all.
But, if you could buy like bnb, and put it on your metamask, and then trade it away on decentralized exchange via some mixer type monero based defi, that would allow you to hide it and you would trade it a lot more, that's when it will show it's true force.
It's just a matter of how to be invisible. When a user already submits KYC and then buys privacy coins on the exchange, then his privacy is compromised already. It's useless. Pretty sure there are people going to be part of it if they can just take the privacy coins and nothing can be traced even thier old wallet.
Cardano afaik has MIDNIGHT https://midnight.iohk.io/
I think they are airdropping these tokens to all holders, I'm just not sure when or how private it is.