I think it would be more interesting to talk about why all these upper-middle-class people are seemingly willing to overpay for things, instead of people eating McDonalds on social media.

There are a multitude of old brands that have hopped on this bandwagon. Brands like Lego, Pokemon, and Disney that started for children are now shifting their target market towards adults with money, maybe without kids, and are willing to pay for their childhood pleasures. I guess McDonalds is one of them too.

I can't remember where I read it, but someone described the ideal Lego customer as a "new software engineer in their mid 20s with a paycheck they want to spend on toys they wanted as a child", in response to Lego's newest release being a $200 branded set.