Because the one the give them the stuff thing they having them will result in other people paying for the stuff.
It is just marketing. Fundamental is a living advertised for the produce and influence the purchasing habit of the one that follows them.
For the one that gives it to that is it a very cheap form of advertisement if you just have to send them an item instead of paying someone to show an ad. Most consumer produce cost very little to make compared to ads so it can be profitable even if they relative few follow the,
For popular influences, the companies likey need to give them the item and money for them to use it. It can still be a very good idea as you can reach exactly the audience for your product.
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