Right. This is contextually dodgy. But its relatively common. I ordered some computer bits from New Egg a couple weeks back. They came packaged with an Atkins diet bar. Last time I ordered something from Lands End it came with body wash samples, female gendered body wash samples in my box of dude pants. I’ve gotten candy, jerky, dog food for that dog I didn’t own at the time. A whole host of toiletries, diet products, and supliments. Men’s and Women’s razors. And even herbal boner pills.
We tend not to see it as often because we order so much through Amazon who don’t generally do it. But its very common for retailers to make promo deals with companies to toss free items in boxes as they ship out. What shows up is effectively random whatever the packer grabs and throws in. And any targeting is based on who a brand is marketing too. Diet products are heavily targeted at women, so they tend to tie themselves to clothing retailers, even men’s clothing retailers.
It would behoove a women’s fast fashion brand. Particularly one targeted at teens and young adults like Forever 21 to not participate in that. But there’s very little chance this is any more targeted than any of the other stuff.