I totally agree with your opinion. I think a lot of influencers forget to stay authentic when promoting something. And very quickly you can notice those ones who promote just because they were paid to do so: the product description has most of the times no personal touch , or every week there’s a new product they absolutely fell in love with. And since all the online marketing trends change so fast, I think both the companies as well as the influencers need to constantly stay in the loop. 
However, I’ve also seen some who promote and make money in a very authentic way.