I love preview and this post covers a number of cool features but I can't help but be extremely frustrated by not only getting a (presumably) newsletter signup without any interaction but also the sheer gall to pop this [0] without a single bit of information as to what you are signing up for. Not title, no description, just "Give us your name and email". I hate these popups to begin with but this takes the cake.

[0] https://imgur.com/a/kDis8Yo