Is there a way to see a rich list and who holds most coins?
I would suggest everyone to use vpn for searching anything on explorer, and read Privacy policy... they can keep IP addresses and personal information as long as they need to.
https://mercurywallet.com/privacy@nicosey
After we all saw what recently happened with Wasabi wallet and zkSNACKs, my question is can something similar happen with Mercury wallet in future?
Answer to you first question no, there is no way to link the coins
Second question no.
Our plan is to transition to lightning payments and then make the statecoins themselves blinded.
Please read,
https://github.com/commerceblock/mercury/blob/master/doc/fee_on_deposit.mdThat would make blacklisting not realistic, however can't predict what could happen.