this is where you guys get stuck on stupid.
it matters not if you've spent on the game, the company is offering an optional product for sale. that's what business do, sell things.
you are free to choose to buy or not, it's all useless anyhow.
English
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True. Free to play games still have to pay server costs; just because it (or part of it) is free to play doesn't mean that it's free to host/run for the creators.