Avoid:
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time limited stuff that is NOT availible through the game, like through watching a stream or buying stuff in the store (okay is you can get it in the game AS WELL)
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Time limited stuff that is availible for less than one week (so people with little time or weird schedules can get it)
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Paid time limited stuff. Microtransactions are completly fine, as long as the thing you are buying is not time limited.
