I was injured very early in my pole journey at a studio with untrained teachers and it has affected and held me back to this day. I strained a rhomboid in my shoulder from inverting too early and I still continue to suffer from occasional muscle spasms, a year and a half later.
Many of us use the logic that it's the dancer's responsibility to research an instructor's qualifications, experience, teaching style, etc. before taking their classes. Honestly, when I took my first pole dancing class, I didn't take it seriously. I was so excited watching my instructors be awesome and when it was presented that I, too, could be flipping upside down and doing awesome tricks, I never even realized I'd just committed to a serious and dangerous sport. The instructors didn't make much emphasis on this factor either.
Within a handful of classes, I was already injured and it wasn’t until after that I finally did some research and found that pole studios don’t require certification. Obviously, the research was a little late. Some experienced polers may be reading this and judging me for not doing the research sooner. In hindsight, I realize it was pretty stupid I hadn’t. Yet, so many girls start classes just as new and oblivious to the world of pole fitness as I was, including the risks.
Certification doesn’t guarantee a great pole instructor, but it does give them ideas of how to provide safer and more well-rounded classes. You can be an amazing, talented, top of the list dancer and still never know everything there is. As a future teacher, my education will never stop because there's always something new to learn and a new way to present it to students. I would hope pole instructors would want as much education and experience under their belts as made available to them to provide the best and safest classes they possibly can.
I 110% agree with Megan12, if anything personal trainer certification is the best bet for instructors. It teaches about the body’s mechanics, needs, and abilities, which will ultimately keep a dancer's body healthy and safe.