They aren't pulled out of thin air. It's just common sense that it costs a lot of money to develop LoL.
And people much smarter than you have decided F2P is a good idea regarding every recent fighting game released or being released in the near future.
I *cringe* that I'm getting involved in this, but:
Injustice: not F2P
MK9 Steam: not F2P
Divekick: not F2P
BBCP: not F2P
JoJo's ASB: not F2P
Darkstalkers Resurrection: not F2P
P4A Euro release: not F2P
Skullgirls steam: not F2P
Tekken Rev: F2P
KI: F2P w/ not F2P option
(Chinese game I can't recall): F2P
You need an extraordinarily narrow definition of recent and a nonsensical definition of near future to make your sentence work. Even if you changed "every" to "majority" it still doesn't.