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People say the game isn't Pay-To-Win seeing as technically everything in the game is achievable through kills/objectives and earning certs through gameplay even as a freeper. However if you look at the rate you get certs, and the costs of items, virtually all of it is impossible to attain without hundreds and hundreds of hours of grinding just to get a few decent items. Just to ensure that recoil, aiming and accuracy is improved to a REALISTIC level, and not a deliberate method to force people to pay for scopes and ACOG like devices, you have to grind for dozens of hours or longer.
Yes, it is pay to win, because in order to get around that, you have to pay to become a premium member or otherwise buy the items outright. Without these items, the game is horrible. It's just more of the same grinding trash.