Bamboo, in mild winter climate areas are like the Bermuda grass of
tall plants. Bamboo is a grass, I believe and it spreads by very
sturdy culms, at least I think that's what the runners are called.

I love the stuff, but it isn't anywhere in my yard.

I have one rather invasive weed, horsetail, but it is IN the pond with
no access to any soil anywhere and can't jump the pond on the sneak!

I think when people have their mind set, that's it. So, trying to
talk someone out of bamboo is futile.