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a design problem with a lot of online social spaces is that it makes not including someone who was previously included a sin of commission, not of omission
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the drama of booting someone out of the group chat is so much more & so much less deniable than just... not hanging out with them as much
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which means including someone who turns out to be a bit annoying (not evil, just consistently a bit of a drain to be around) can be a death sentence for the group. no good reason to kick them out, all that's left is for everyone else to just drift away