It's news to me. I run multiple master nodes, and I have no idea how to "collude". There are over 4000 nodes, and no way to know who runs them, so even if coordination was possible, it would be quite a feat. The DASH software is a clone of BTC and open for anyone to inspect.
RE: Crypto 101: Episode Next: The DASH Difference- What makes it unique, why everyone talks about it & why it's always a top Crypto