When I see unsolicited links on my threads, I hide the comment if possible, otherwise I'm forced to block the author. (No, I don't know why it isn't always visible for me to hide the comment. Solving that one's on my to-do list) There are threads where I do specifically invite links, but unsolicited links are a no-no. I just don't have time to police the legitimacy of this stuff, and God knows the platform doesn't, so it's best to keep it nipped in the bud. If the links were only fiction/personal experience, I wouldn't care, but too often they're bad "advice" from folks with less developed ethics.