What's worrying ppl is their spying with blockchain analysis companies.
What is worrying people is that they were one of the best privacy companies, until they started funding and giving permission to a surveillance company with the aim to de-anonymize everyone. Which is needless to say that it is makes no bloody sense.
You are confused, the coinjoin services zkSNACKs sells are a bad thing for chain analysis companies because their coinjoins create a huge hole in their data set that breaks their ability to track participants.
You have literally given them the permission to reject any coin that requested to be coinjoined. What the fuck are you talking about?