To my mind, the ideal would be that if you, as the person who wants to share some 'open-source' news, chose one community that you think is 'best' (based on what instance it's on, if the mods are real people and are active, participation levels, whatever you think really). And we, as subscribers, would do the same. This way, the 'good' communities would thrive, and the 'bad' ones would wither away. What happens at the minute, is that there's 8 communities for open source, and there'll always will be, because they aren't in competition with one another.

(this is mostly just a general point about cross-posting behaviour, it's not meant as a dig at you personally).