That are good questions and I would like to see openchange answering on them, but in reality this magical AMLbot can one time flag address coming from CM as high risk, second time as medium risk, and third time as low risk... it's like lottery.
There are some free tools for testing this and last time I tested them it was giving medium risk for most coins coming from exchanges like Binance.
Now we don't have proof that openchange is using Binance and WhiteBIT but they claim they are using this two exchanges.

Let me play evil advocate here...
What happens if they only have multiple accounts at Binance exchange, and they really receive warning and frozen funds by Binance.
They could easily prove this by showing us screenshot from that message and this would stop all speculations.
My question is what happens with those (unclean) coins that are now mixed with supposed clean coins, and how can anyone separate clean from unclean coins?
It's ridiculous concept