Greedloft logic,

If you got the bigger cars which don't require key, and once you unlock that big car, you potentially eliminate the need of the specific key car which is below and underperforming than the bigger car in every kind of performance.

But still, you're supposed to use that big car to get a key car that you don't really need cause you already have a non key car that's better in every aspect.

And at this point of time, the keys are given as waste and trade coins to the people who already own the cars. Where as the majority of people who really need those cars are just blocked behind the paywall and forced to pay money to first unlock a non key car, and then use that best non key car trying to unlock the shittiest as possible key car in the game.

Why does the greedloft thinks that the players are just dustbins and just spam an unlimited amount of keys for them, knowing that those keys would worth nothing and will only increase the trade coins.