Funny cause in the past wekan did get into trouble over the use of a similar logo and stylesheets taken from Trello (iirc).
They've come a long way since and I think with time they can really shape up to become a strong competitor to Trello.
Side note:
When I was working in a corporate environment I was able to setup an instance myself to help organize my tasks. Had I used Trello it would've been against our policy if I potentially left sensitive data on there and hard(read: impossible for me alone) to get permission to use Trello officially.
They've come a long way since and I think with time they can really shape up to become a strong competitor to Trello.
Side note: When I was working in a corporate environment I was able to setup an instance myself to help organize my tasks. Had I used Trello it would've been against our policy if I potentially left sensitive data on there and hard(read: impossible for me alone) to get permission to use Trello officially.