Re: No players on dlc server operations
Well Battlefield 1 is a rather old game, coming out in 2016 and the four DLCs releasing throughout 2017 and early 2018. With this in mind, it is rather expected for there not to be that many active DLC games, which is a shame because I personally find them to be better than the base game maps. However, every now and then there is a weekly map rotation that has DLC maps in them. For example, a couple of weeks ago there were conquest and operation map rotations based around the French DLC - They Shall Not Pass. If I were you, I wouldn't refund the DLCs you purchased, because before too long, they will most likely be back in rotation.
Another thing to keep in mind is your server region, as Battlefield 1 is starting to loose player counts in some regions.
Hope this helps!