Why does every website need to look alike? What happened to some whimsical stuff that does something out of the norm? Stop being responsible for draining all of the fun and creativity from the world.

I think this style of UI might suck a little for browsers that try and autofill email/username/password suggestions, but overall I find it a little more clever and interesting than a generic bootstrap form. As a bonus, this probably introduces a bit of friction to bad actors that try and programmatically mass-produce accounts.