Why is the packaging of Yili milk not Tetra Pak? Did I buy pirated copies? Thank you, everyone.

Why is the packaging of Yili milk not Tetra Pak? Did I buy pirated copies? Tetra Pak and Kangmei are just two kinds of packaging; Don't make a fuss, Tetra Pak's packaging is a Swedish patent; Kangmei packaging is a German product. In addition; The contract between Yili Milk and Tetra Pak seems to have expired, so it was changed to Kangmei packaging in Germany. It is also said that the cost of German Kangmei packaging is much cheaper than that of Swedish Tetra Pak packaging. In short; Enterprises have their own choices, so we should not care too much.