As a VC-backed company, perhaps The Browser Company was always going to need to sell. My initial reaction is Atlassian seems a weird fit. But maybe not? From The Verge:

Miller is clear, even forceful, that Dia is not about to become just a wrapper for Atlassian apps, or shift to thinking primarily about IT managers and enterprise features. Dia is still for individual users. It’s just that now, it’s primarily for individual users at work.

I’m really enjoying Dia. I’ll probably keep using it unless or until it gets worse.