This is a collaborative tool. So you cannot say "only 5% of the audience is Linux users", but instead you'll rule out any team where at least one member is Linux user. Which is a far larger group.

If I discount myself, that's 8 of 9 teams and startups I worked in last years where we needed wireframing.

But I hope the Konty team has better numbers on this. I presume they know more than my anecdotal numbers.