That's because it is hard to discern what is shilling and what is a real / expert opinion. Shilling happens here on HN, like it does on every social media platform / discussion forum. It doesn't help that we can't call out suspected shilling on HN as it is against the rule. But that rule makes sense because suspicion is not proof, and it would just bring down the quality of discussion here if everyone of us accuses the other of shilling :). (And as someone once pointed out to me, sometimes these shillings are not necessarily from the marketing team but from employees and shareholders here, who have a vested interest in seeing the company do well.)