Not quite as suspicious when you see why the app was passing URL data to their servers. Still silly of them not to make any mention of it and not expect anybody to get suspicious.
if you use Dolphin HD, you might want to read this ...
"The newest version of Dolphin HD for Android 7.0 relays browsing information to a Webzine-specific URL. This information was never stored on our servers, and no browsing information has been captured about our users.
For some background, with Dolphin HD for Android 7.0, we rolled out a handful of updates to our Webzine feature. One of these is a "Toggle Webzine" button to view your current webpage as a Webzine. We currently have around 300 Webzines, and it was necessary for the client to check the current user URL against a database housing these 300 Webzine columns, which is what has caused this concern. None of the URLs have ever been stored by Dolphin, but were being used to cross-index if a Webzine for the current site exists. If it does, the current site is immediately converted to Webzine format; if not, it remains the standard mobile site. Again, none of this process is stored on the backend of our servers.
Note that this functionality has been completely removed for the time being.
We'll have a blog post up soon that will explain more."