the issue with this approach is if you depend on it, it may just go away some day, either with the police called and if they track it back to you, you may be prosecuted under the laws that protect utilities. These are less forgiving than you might think.

It's a big deal to damage someone elses infrastructure, can result in bills and lawsuit to reclaim losses. If the pole owner notices, they may do something (or just ignore it). What you don't want is them tearing down your stuff without notice.