> Ironically, a good workaround is setting your user agent to the Googlebot and suddenly all those modal/nag screens disappear.

Hmmmm. Now that I think of it I'm fairly sure that serving different content to Googlebot compared to what you served ordinary users used to be a good way to call down the wrath of the SEO master upon your (or your clients) website.

Then again, that was before. Back when Google was a nice company and acted in the best interest of its users.