Burvey: To moderate my previous point though, I don't know if using such a Kickstarter campain really goes across the free license use after thinking about it.
One can consider that those people are not "actively" making money through the usage of Construct 2.
That's a case Scirra has the final word on, and perhaps tolerate (I have seen no statement on that case from their part).
Allchix: can you link to a place where it's actually requiring money to play the games ?
I googled their game as well, and on android it's free to install (I haven't checked if there are IAPs though) and on FFmarketPlace "PettyPlanetFirstLand" only appears as "unavailable on my platform". X-Infected appears as free.
C2 free version allows you to publish as long as you're not making money, and from my research, it looks like the guys are actually obeying that rule.
Strange thing though is that Android export is supposedly a paid only feature. But there are ways to compile an APK manually I guess.