That's an understatement of the century. My mom brought some home in a 5 gallong bucket in 1986 from a nursery It was very pretty for many years as it spread across her backyard. It would die off in the cold, she'd panic, then it would send up shoots, ankle snapping shoots all over the yard. It took over almost 1/6 of an acre before it made it to the neighbors yards on all three sides of her ,50 and 60 feet away. You could mow it down if you caught it early enough, but usually the grass died around the shoots, leaving ugly spots. Now the neighbors have bamboo. It is now about the area half the size of a football field. 5 years ago mom didn't want it anymore. So she hired a company to come out and get it out. They chopped it all down. It came back. They came back and chopped it down and poisoned it. It came back.
Finally two years ago, they came in chopped it all down, moved the top 6 inches of soil, poisoned it, and put new soil back.
$5000 down the drain all over a novelty bucket of $20 black bamboo
So here we are in 2020. Mom's bamboo is in the neighbors yards (they like it as a privacy screen.) As far as I know the bamboo in her yard is not back. (She passed away in August)
My vote is for RUN LIKE HELL.
She's lucky the neighbors didn't hold her liable for the removal of the stuff in their yards too.