> Letting all causes be elevated via unrelated venues would be untenable

I'm not sure it would be untenable. People generally intuit the social cost/risk that comes with making a statement in an unrelated venue. That is a natural force acting against people randomly bringing up strongly held opinions on unrelated platforms. Explicitly drawing and enforcing a line just doesn't seem necessary.

> I suppose it's not totally unreasonable to draw that line by saying, "all content must be related to the topic at hand"

I think this would have the effect of either completely sterilizing platform discussion or being impossible to enforce reasonably. For instance, what would happen if a competitor just mentioned something totally innocuous that would incense nobody but was off-topic? Should that be punished?

that's what the off topic subforum is for, every site should have one in some form as every true community wants to talk about unrelated (to the main site topic) stuff especially as people get to know one another