The closest that Paradox has come to endorsing paid third-party mods in the past is something like For the Glory. I can imagine Paradox using this model in future (i.e. specific endorsed projects, with Paradox retaining publishing rights, including the ability to pull the plug at any time), but a free-for-all on paid-for mods sounds like too big a gamble for Paradox to take any time soon.
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