They prevent lawsuits by not making claims. You will absolutely never see a guarantee from these companies nor will you see any claims that it even helps in an injury. This is also the main reason they don’t send products to be independently tested. Unfortunate these neck braces have arguably made many neck and back injuries worse according to doctors, and people have tried to go after Atlas and leatte, there was even a class action lawsuit started by some AMA members.
Unfortunately these companies have spent more money in developing legal jargon to not be liable than they have in R&D for their products. This is a topic that I have researched many times throughout the years as a former MX racer. If you look at the websites for these braces you will see many testimonials but the companies that make them won’t go past the word protection to describe their product. Suing them is like suing Simpson because you crashed because your race shoe ripped.