The same reason the shaker has Huel printed on the side. Its primary function isn’t to incentivise first-time buyers. The idea is that you have a free shirt, you might as well wear it, and the Huel name gets more exposure.
I’m pretty much a walking Huel billboard.
I have a Huel T-shirt, rucksack, hoody, water bottle, shaker and even a Huel towel for at the gym
I wouldn’t normally choose to advertise any brand, even one I like, but I like free stuff and it’s all useful so here i am… the walking advert