Thats the weirdest thing. Because my pure (never subbed, not linked to a main bnet account) F2P can use them. Maybe its a glitch in how the professions register when you swap back and forth? Because all I did was hit cooking 100 and buy the recipe from the dude in SW. ezpz.
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Maybe when you sub, it gets recognized as a "higher level" food and so when the sub runs out its no longer available?
As for the Darkmoon fish, just farm the shipwrecked debris. It takes a little bit more dedication but you can get like 6-10 per pool. Didnt take me long to put together a significant amount.