We don't see Trello as a competitor at all, that's why we integrate with it, just like we do with GitHub or Slack. And we use them both together every day at Fog Creek.
That's not really what I meant. What I really meant was that Manuscript very clearly does project management (it's even in the title of the site), which Trello did. I imagine that would be a 'no-no' in the Trello sale to Atlassian.
Manuscript is basically FogBugz, which is a Fog Creek product that predates Trello, so there must have been some kind of allowance for Fog Creek to continue to sell it. It's possible I'm wrong, but I'd be extremely surprised if that was the case.
Or is that not the case, contractually?