Comments from this video below

Very much doubt that Dukascopy is stop-hunting. They are a Swiss regulated ECN, so it's surely extremely unlikely that they run a secret B Book. If you trade fast charts, your stops will execute with much less slippage if you place them on their server - virtual stops will likely cost you, and for no real benefit.

 

http://quantlabs.net/blog/2017/12/does-dukascopy-stop-hunt-in-forex-trading-or-run-a-secret-b-book-screenflow/