This means that stolen coins should receive another layer of the theft label, this time by FF.
How should such cases be treated?
Let me just add how they handled a "taint" case in the past:
Funds from our hot addresses are automatically consolidated to our main addresses, as funds are sent from us only from our main addresses. Thus, law enforcement agencies see that the funds have been transferred to the addresses of our service.
Following the above transactions, it looks like you've "mixed" OPs funds with other funds and consolidated them into
bc1qns9f7yfx3ry9lj6yz7c9er0vwa0ye2eklpzqfw. Aren't you concerned that those funds you deemed
criminal are now in your own address, meaning anyone that receives Bitcoin from your exchange now receives some of those
criminal funds? It shows once again that "taint" is only made-up BS.
The funds remain frozen at our addresses, and when the frozen funds are seized by the authorities, they are also sent from our addresses.
That's not true. You say the funds "remain frozen", but that can't be since you've
mixed them already.
The first transaction was mixed
in this transaction and that same output was used to
sent to another address. The second transaction was mixed
in this transaction and also
sent to another address.
None of the funds were frozen in your wallet, you're
normally using them to pay other people.
To summarize:
if those funds came from criminal activity as you claim, you've now sent it to other innocent users who now own those "tainted" Bitcoins.
It sounds very much like you only care about "taint" when it's convenient for you.