Part of me is interested, part of me is horrified by the idea of DIY electroshock therapy.

What exactly is DIY here? TENS devices are FDA approved and these are well known settings / protocols for different conditions.

DIY is "Do It Yourself" as in, not having trained professionals do it for you, therefore, the whole thing is DIY. Sure, maybe less DIY than making a pickaxe out of stone and mining the raw metals to build a tens device from actual scratch, but doing it to yourself is doing it yourself.

Yes you should absolutely talk to your doctor or an expert before doing it. But that doesn't make it "DIY". I was just pointing out that you don't have to buy a startup's expensive device to get the same functionality.