I commonly browse all by new, and I block users who crosspost any given article to more than one other community. To me it’s almost always a sign that they actually don’t care about the topic or contents, but instead their own post count and user recognition.
Eh, meh, like I’d have to see it. The way you’re explaining it, I probably wouldn’t block. Again, because it seems like you’re trying to enrich communities that mean a damn to you. If you were just flinging shit to be the king of shit, who broke the news of the shit first… yeah, I’d block.