It seems to me they do know your coins came from a mixer; whether or not that is important varies from place to place. [...]
But any mixer such as Thormixer that is using the Jambler software gives you 0-25% AML coins, which are not supposed to be traceable since they're just selling you exchanges' and miners' coins (Here's proof that I have created several months ago), so either the alarm bells are in one of the outgoing transactions, or Coingate thinks every wallet aggregation is "money laundering". There's also a third possibility, that the campaign manager fumbled the coins before sending them to us, but I don't think icopress would do such a thing, so I'm discounting it. [...]
There is no difference between transactions for the Whale, Tormixer, BC or eXch campaign, since when I receive funds (including USDT funds that I sometimes exchange using Binance), I check them using the AML bot and move part of the funds to Electrum, after which I process weekly payments.
It's just that centralized services are going crazy ... I recently encountered an even more absurd problem as I had to provide a report (and screenshot) of a withdrawal from Binance to a Bitcoin address belonging to Sportsbet.
