"How openness becomes exclusionary" is the title of an essay on imported, created and path-dependent diversity deficits in online communities that explicitly describe themselves as "open": https://openfuture.eu/paradox-of-open-responses/how-openness-becomes-exclusionary/
It is part of a great collection of essays responding to the essay "Paradox of Open" by @alek & @paulk from @openfuture: http://paradox.openfuture.eu/responses/