Exactly. "Grinding" is the concept of investing time instead of money. In a typical F2P type game you can put in a bunch of hours and see a linear relationship between time played and currency earned (usually up to some cap). It is how F2P players can make up ground. That doesn't exist in ootp, everyone gets the same number of games and the whales are the ones earning the most free points unless you are sandbagging.
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