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I'm not sure there's a lot we can do about this, other than potentially adding a warning if MathJax is enabled. It's hard to reliably detect MathJax in a post, and even harder to reliably remove it...
Answer
#1: Initial revision
I'm not sure there's a lot we can do about this, other than potentially adding a warning if MathJax is enabled. It's hard to reliably detect MathJax in a post, and even harder to reliably remove it - so disabling or content-triggered warnings aren't realistically doable. We could add a simple warning above the profile field on all communities where MathJax is enabled to say that if you use MathJax it will not render on other communities.