Unicode = a standard. Specific software = *implementations* of Unicode. Totally fine for implementation developers to say "we choose to not support rendering certain character combinations." Problem solved!
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Not sure why you think a simple list of do-not-render sequences entails “massive cost.” See the Pinterest example via
@zeynep in my earlier tweet Her book has a solid intro on how affordances of social technologies shape behaviour. This is not new stuff—reading it will help
+ ⃠ = It won't work, because the trolls who would actually use this maliciously *love* a technical challenge, and any time someone comes up with a new offensive sequence everyone can just copy and paste it trivially. This is like word filters. They don't work.