I don't see how you think PnW is Pay to Win. Sure I could buy 100 credits with real cash, but it's not like I would be able to use them all at once, there are limits on their use, I could also just as easily buy credits with in game cash and again would be limited on how many I could use in a month.
The uses for credits, the gains in terms of resources is rather insignificant in the long term. I'd argue a majority of credits used are for timers, which sure give you a minuscule increase in growth speed, but you'd also have to actually be able to afford the growth itself.