"People with mild or moderate hearing loss" should be free to purchase these sort of generic hearing aids in much the same way that buying non-prescription reading glasses is common. If problems persist, it is time to consult a professional.
I’d argue that there should be a giant warning on the box about proper tuning, and leave it at that.
These are limited to 85db output. I have a pair that I use in my woodshop as hearing protection, which they are rated for, and really like that my music or podcast stays at a consistent volume. I also have volume normalizing turned on in Spotify.