How social media works is that we all know each other - we've all interacted on many topics before. So we have a degree of trust in each other, and our motivations. People know what I do, and they know I don't work/own a feed company for example. So if I give feed recommendations, they know it is from my personal experience and a desire to help.
If a newbie suddenly appears, bumping a thread from 2016, singing the praises of a feed they have only used for a week, using the same language as the last newbie...it perhaps lacks credibility.
But yeah, we are all bullies.