It doesn't bother me too much, all in all. Distracting, sure, but then again, they found a way to draw your attention to the most important button on their website (in their opinion). It doesn't obscure the content like a popup or prevent you from closing the tab with an alert. By my book, that's playing by the rules.

Nah it's not that bad but it's similar to seeing a '.biz' domain or comic-sans font - an innate heuristic that informs my brain to nope the hell out of there.

It triggers the this is scammy response (no matter how unjustly).