Total bullshit. Open source isn't a religion it's a way for everyone to be more efficient. Scenario: upverter goes huge, makes lots of money and ends up patching dozens of open source projects as they go. What's the problem in that? They already have plans to support every major export format so people don't even need the code in case they go under. They are tackling such a hard problem with only two full time hackers, a designer, and a CEO they don't have time for an ivory tower, clean code every where, FOSS stack.