Intrigued by Pixelpipe, I’ve been examining its terms & conditions. Here’s a key clause:

Unless we indicate otherwise on the Site, you retain all copyright in any User Content you post on the Site. However, by posting any User Content or otherwise participating in any Interactive Area, you grant Pixelpipe a perpetual, irrevocable, nonexclusive, royalty-free, and fully sublicensable right to use, publish, distribute, reproduce, perform, adapt and display the User Content on or in connection with the Site and the Service, including the right to use the name that is submitted in connection with such Content. You further understand and agree that, in order to help ensure smooth operation of our system, we may keep backup copies of User Content indefinitely.

So that’s another one I won’t be using, then.