This app was mentioned in 2 comments, with an average of 1.00 upvote
Again, what P2W titles did I defend? Please tell me. Also, is this the Airline Manager you're taking about? I didn't see anything about it being an MMO, and even if it is online at all, it's just text and data sheets. It could be a single Dev with a single server in his basement with 100,000 Excel files. How? There's no constant face-to-face, real-time, ever changing, online interaction.
Think about WoW, or Vainglory. Those games require servers in more than one part of the world, and they need a lot of them. They both use 2 perfectly good pay models. WoW is subscription based, a monthly fee that has a history of over a decade proving that the devs are still working on and expanding the game. Vainglory is F2P with a cashshop (IIRC as I haven't played the game in almost a year) where you can buy skins. Or even LoL where you can earn the premium currency in game. You don't get better by paying, rather by playing.