This is the worst UX I've seen in a long time. Not only that, it's visually garish. Apparently the designers at Dropbox have never heard of color theory.
My initial impression was they were intentionally breaking color theory rules, maybe as a way to stand out. It gives off a trendy, hipster vibe. I can't imagine this aesthetic aging well.
The marketing language describes it as a celebration of "creativity". In that regard, I do find the work of various artists they're featuring (particularly the portrait and illustration at the top) to be great and in line with their stated principles. Really though, the colors and typography on this page don't work well. Going against the grain doesn't mean you throw the baby out with the bathwater (or aesthetics in this case). Even some of the most envelope-pushing artists of the past century, like Basquiat or Rothko, understood this and broke rules in a way that expressed some creative truth. Maybe I'm overthinking it but it's going to take more than "creativity for creativity's sake" for me to appreciate what's going on here.