It's only Ryanair who pay 0 fees to airports in Spain. Other airlines do get reduced fees but they are not 0 anyway.
If Ryanair and Aer Lingus don't act on the reduced tax now it will be back to €10 in the next budget. If there is growth in tourism this year then it may be axed in the next Budget. This is a time for Ryanair to prove that it damages tourism.
The charges at Dublin Airport are very cheep to some European airports. Ryanair expect to fly to major airport for nothing.
I haven't seen Ryanair kick up a fuss about the French travel tax but I don't know how much it is myself.