For
It is just advertising, like any other industry.
Against
It misleads customers and creates false expectations.
Anonymous excerpts, translated where noted.
“Because it still works”
“personally im not gonna use a product for nine months just to test if its good enough to promote to my fans”
“we as their fans buy it because our inspiration/role model/favourite celebrity is promoting that product”
“I know they’re paid to pretend like they love XYZ product and I won’t be fooled by that.”