Today I tried launching ck2 on my 2017 MacBook Air with Big Sur running and no luck. On Reddit people also have had this problem for over 2 months and no fix yet 
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We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
It is in the works but there has been no date announced as yet, I'm sorry.
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