The simple answer is that Genshin Impact is a very popular franchise right now, and with that, a lot of companies are going to try and make a quick buck by selling lower quality merch for cheap. A lot of these hoodies also feature lazy designs and poor quality materials, so while they may be cheap in price, they'll also feel and look cheap. I'd recommend spending a little more for a higher quality product than having to buy and replace a hoodie every three months because it was cheaply made.