The first website I remember using this style is Ableton (https://www.ableton.com/). They built it many years ago.

That's true! I remember that!

Haha yeah, that's getting trendy. But to be honest, this style reminds me of the 90's like you said and it matches perfectly the street art and retro style you'll find in Brick Lane, where we have our London office: http://www.sundayupmarket.co.uk/

One of our co-founders and Artist Director is actually a street artist, so many inspiration from there :-)

The dropbox design page looks like Neubrutalism to me, but the OP link almost seems like something else. Hard to say.