Not sure if anybody heard about it but according to a scientist experienced in discrete math and computer science it is possible to analyze all actually existing privacy coins to know which address is getting which amounts. This is confirmed for hardest to analyze chains like ZEC (due to massive use of t-addr) and XMR (due to not enough tx per block easy to analise).
The only known coin that is not yet broken is guess what ? Pirate Chain
z->z tx is still being tested , but initially it survived the analisis method worked out by a researcher.
The article about it is going to go out in week or two.
Details you may ask on Hush or Pirate discord.
Teaser:
https://imgur.com/szcIxq4https://imgur.com/dW6inuU