it’s mostly rent-seeking behaviour.
try contributing to one of these “open communities” while publishing your things independently. they will hate you the moment you show you’re not interested in uploading your stuff onto their organisations where they have mod powers.
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RT @EricRichards22
I sort of suspect that a lot of the people who piss and whine and bitch and moan about this the most don't actually do anything, but instead w…
https://twitter.com/EricRichards22/status/1469802406141698051