Corporate-forced trend. New Stanley executive is the former Crocs CEO, who found out you can manufacture a trend with limited editions/FOMO marketing, paying off influencers, and making people feel kitsch for buying objectively ugly products.
They're decent to high quality insulated cups that are made popular by a cycle of induced scarcity. The CEO imported Sneaker Culture, producing only limited supplies and limiting releases of sponsored partnership-products, so that the fact that they can be hard to find makes more people feel like it's important to try to find and buy them.
This exact question was asked on a different out of the loop community 4 days ago. Do we really need more lazy ass pointless content?
If you actually cared about this question you were asking you could have found an answer with barely any effort. It took me 10 seconds - https://lemmy.world/post/11068810