Okay then what does the in game currency buy?
from their website it seems to be used to purchase "Mechs, Weapons, Electronics, Paint, and Modules"
and those seem to be used on the battlefield
and based on their forums, those items can be quite expensive.
(I have played games in the past that have done similar things and they are truly pay to win as getting those items through playing will be impractical due to the amount of time it would take.
it is optional to buy that stuff and everyone is free to spend their money how ever they want but it does not mean that people don't get to comment on how that money is spend. (think buying a gold toilet (but less useful).
If you feel that the game is not play to win then answer this, If I were to compete with you right now and we both just started, and you had 10,000k C-Bills, and I had 0 (you would likely be able to buy more decks and better ones, have weapons with higher hit chances, and a host of other advantages)
who would do better (assuming that were were also of the same skill level?
Many games that use this model will eventually impose (indirectly) a limit on how well they can do, for example a game like spiral knights will allow you to earn currency through battling, but after you reach 3 star gear, 4 and 5 star gear become multiple times more expensive (and due to the length of time per mission and the amount of money you get from each one, you would have to play for roughly 1000 hours to upgrade your sword and another thousand for a new shield, and another thousand for each new piece of armor)
Pay to win does not have to mean that certain things that give you an advantage are locked behind a pay wall, it can just mean that things that you can get through regular play are impractical to get without paying.
Imagine if someone wanted to ban ban broadcast television but did not have the authority to, but they were able to regulate it, so they passed a regulation that limited broadcast tv to a resolution of 4x4 (4 pixels by 4 pixels) and limited the audio to to a 16 sound font bank midi, how many people will continue to watch broadcast television (it was not banned but I bet a lot will)
When I bash it for pay to win, I am basing it off of the spirit of what pay to win means.