You could also turn this around: Why would a company put up warnings about their product, or at least more than they're legally obligated to. The tobacco and social media industries certainly didn't go "this product has the risk to do great harm, but we also believe in its potential, so we'll go with a responsible approach".

The only examples of companies voluntarily putting up warnings I can think of are those obviously tongue-in-cheek warnings "this book/game/series may cause addiction because it's just so good" etc.