OpenBCI used to sell a direct current stimulator, too. When I began purchasing, they took it off the shelves, citing a research study that it was unhealthy or dangerous. I believe direct current stimulation is a way to entrain channels in the brain to observe areas not near the surface, and was very sad to not have access to the open source equipment once I had saved enough money to buy it.
There is a class-associated concern with direct current stimulation, too. It can be used to break addictions or form difficult habits, and increase the intelligence. Preventing access to it is oppression comparable to censorship, gun control, etc. I definitely agree that people need to be aware of dangers, however. Maybe proposing a plan to develop systems of certification or licensing or having an age boundary? This could help people form training groups too.