"So the #1 best rule [for going viral] is: Have overwhelmingly awesome content. So good that people intrinsically want to spread the word."
https://blog.asmartbear.com/darwinian-explanation-and-advice-for-going-viral.html
From: Darwinian explanation and advice for “Going Viral”
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Ever thought that the AGPL was too weak and didn't encourage sharing source code? The SSPL is a viral copyleft license that requires you to share all the other software supporting your service!
https://lwn.net/Articles/768670/
(I'm struggling to imagine anyone who would use this.)