> They still didn't explain how exactly is zkSNACKs Ltd going to blacklist certain unspent transaction outputs if they are not monitoring and collecting user data

We didn't explain, because it's trivial. By architecture, the Wasabi coordinator cannot breach the privacy of its users. It does not mean the coordinator chooses to not collect data, but it means it couldn't collect even if it wanted to. The coordinator only knows of the UTXOs to take part in coinjoins - so does the public - and that's not a privacy leak.