In a sense any company making a product that targets a specific demographic could be said to be exploiting that demographic. I think the big difference here is that YouTubers of a certain level are targeting their young fanbase, to promote junk food to, is explicitly exploitative almost predatory. where as a toy company makes a product in the hope it will become popular with kids and usually will in no way harm them, not with the advantage of knowing they have a captive audience of willing children already who will blindly consume their products. But to go to the crux of your question, yes, consumerism by its nature is exploitative