It'd only take one to justify it. And even zero isn't necessarily a negative outcome. From the point of view of someone whose performance is measured by the number of commercial SQL Server licenses sold, there's no distinction between someone who gets a copy of SQL Server Express and someone who gives up in frustration and grabs a copy of PostgreSQL instead.

To the company there's absolutely a distinction. And to someone who's playing the long game there's absolutely a distinction. But those are red herrings. This decision's probably being made by someone who's got an annual performance review to worry about.