Why do throw pillow covers from Amazon brands cost so much less than boutique ones?

Reddit decor communities discuss this openly: brands like MIULEE, Foindtower, CaliTime, and lifein use polyester or poly-blend fabrics manufactured at scale, while boutique covers typically use heavier natural linens, hand-block printing, or hidden construction details. Reviewers say the Amazon options look great on camera and from a few feet away, but feel noticeably thinner in hand.