Harm to competitors literally means less competition in the market for producing good products for consumers. In the worst case, that means you depend on a sing

Harm to competitors literally means less competition in the market for producing good products for consumers. In the worst case, that means you depend on a single monopoly corporation to produce the best possible product. It is almost a given that that results in lower-quality products for consumers. Although it might be hard to prove using examples - as the better products that would have existed simply never appear in the first place. It isn't that competitors fail, although that happens too. It is that it is irrational for competitors to even try to spend money on products to compete against a monopoly that will crush them.