The more "remote" area, the more it probably has local characteristics. But even more so, I strongly believe that this type of culture is build by active participants and shape of the network may be dominated by interests of merely handful of "key players".
Their labels releases music they're into, their gigs are by bands they're into, their distribution lists are filled with items related to these styles. Magazines they contribute or publish often reflect the style as well. It enables situation where this is among main things what creates the "visible culture". We might not know what people listen at their homes, did they like the gigs they saw, what all they happen to buy and where, but work of the key players of "scene" may be seen.
When thinking of Canada, I could think of Freedom In A Vacuum. Defunct Canadian experimental, industrial label run by Robert W. Olver. Operated in conjunction with his "Freedom In A Vacuum" events at the Music Gallery in Toronto. as discogs info says. Checking out the labels releases (HNAS, Unkommuniti, Grey Wolves, PBK, Dog As Master, Nails of Christ, Vivenza,etc) it is very much of "our side of industrial" (haha!), but certainly when we talk of label who quit already in 1990 - its effect now may be minimal?
But at the same time, this can have been a important activity at the time, defining moment of genre. If Canada lacks the guy who is willing to bang his head against the wall, trying to promote that industrial he likes, one can always step up for that task. Often things only need couple active guys, and that's it. Rest will follow with its own weight.
When thinking of whether it's marginal of central - thinking of print runs as "50 tapes", of course it's marginal interest by any standards. But there no need to be surprised that special interests are marginal compared to interests of average man. And this reality certainly doesn't have to affect negatively to what you choose to do.