According to linked Engadget article: (http://www.engadget.com/2012/02/25/is-your-android-app-on-blackberry-app-world-without-you-knowing/ )
“By the Handster standard distribution agreement, we can distribute apps via our main store and our partner network. Most of the developers use this agreement. Handster serves as hub, where you can publish app and cover multiple channels. As a result, developers generate higher revenue and more downloads for their products. Before publishing any app to new partner channel, we sent notification email to all developers, with information about the partnership. Except notification email, there is usually prior press release and about the coming partnership.”
Sounds like opera has nothing to do with this. Just the Dolphin HD creators who obviously didn’t care to read what the ‘distribution agreement’ that they agreed with actually said… So it seems it’s their own fault