There is also local politics in Poland about airport expansion and ownership at play here as well. The starting of new routes to Warsaw, whilst moving Polish domestic routes to Chopin Airport, despite the fact Chopin not wanting them there is part of that.
Basically Modlin is 90% full and the owner of Chopin Airport is trying to take complete control in a bid to what many people see as a chance to stifle the growth of Ryanair in Warsaw which is growing at a huge rate, coupled with Wizz expanding to a smaller degree at Chopin, is not helping LOT at all.
Polish State airports showed little interest in Modlin until in the last 12-18 months they started to have a very sharp rise in passenger numbers at the expense of LOT and other carriers now they want to run both airports in Warsaw, which will be very much to the benefit of those operate at Chopin right now.
Ryanair here are saying, if you don't expand Modlin, we'll just move routes which will hurt you the most to Chopin, whilst the airlines at Chopin are hoping that Modlin and Chopin come under common ownership so the difference between charges at the two airports is reduced and the rate of expansion by Ryanair is reduced to stop Ryanair undercutting them.