You're raising a valid and interesting point, and indeed we have been worrying about that possibility as well.
Dermaneedling is a "game changer", a "paradigm shift" in skincare in the sense that extremely effective treatment suddenly becomes cheaply available to the masses. Suddenly, anyone with a few dollars and some effort and patience can greatly improve their acne scars and stretchmarks, something that used to cost thousands in a specialized clinic with lasers and the like.
Naturally, the thousands of wealthy doctors that paid a small fortune for their lasers will lobby to get home needling banned. They will most likely succeed, because authority figures, themselves unqualified, tend to listen to doctor's advice, and that advice will be "ban it". For the same reasons, home teeth whitening products have been banned as a result of the dentists' lobby, and those who sell them have been declared criminals of the worst kind (just below murder) and get jailed for YEARS:
https://http://www.dailymail.co.uk/news/article-2232745/Barrington-Armstrong-Thorpe-jailed-16-months-selling-illegal-tooth-whitening-gel-online-100-TIMES-safe-level-cleaning-chemicals.htmlWe will suddenly start reading media reports how "home rollers" died a horrible, drawn-out death of gangrene and their arms and legs and eventually their head had to be amputated etc. etc., with a warning about "ruthless cynical online scammers" selling "dangerous fraudulent needle devices". Then customs officers around the world will be notified not to let dermaneedling instruments through.
This exact scenario happened with the BreastLight for example, a cheap but rather effective home breast lump diagnosis device that puts the power of early diagnosis in the hands of women:
https://http://www.dailymail.co.uk/health/article-2215339/Breastlight-Thousands-misled-torch-claims-detect-breast-cancer.htmlThe Breastlight was declared a "fake and dangerous device" and its vendors criminals. The device was then banned worldwide. Not because it's illegal by any law, but just because. By some type of executive order or request to countries. And they complied.
So this scenario plays itself out whenever the profits of the established order are threatened. Something that is cheap and that really works is a severe threat and they will fight tooth and nail to get it banned.