from everything I have read this is just like the lite version of Resolve - you can use it for commercial work.
and yes, of course it's designed to capture market share
in the VFX world there is really only one compositing app -> Nuke
After Effects simply can't handle the requirements for VFX work (see :
http://scriptsofanotherdimension.tumblr.com/ )
Flame/Inferno are still VERY expensive and are use more in commercials and for finishing
so there is a real opportunity to compete with Nuke - once a mac (and even better a linux) version is released.
I see a lot of people installing this with the idea that it's a great free tool - but most of these people don't have a problem that this tool is designed to solve...if you're using After Effects and are happy with it then Fusion (or Nuke) isn't going to get you anything you don't already have/need, if you use Nuke there is no point getting Fusion, since Nuke is better and is used by far more artists/studios, if you have a Flame you're likely already using After Effects/Nuke/Smoke for prep work already, so again there is little use for Fusion. However, if you find you do need a real compositing solution or you're just interested in learning how a node based compositing app work then this is a great opportunity to try it out...until the non-commercial version of Nuke is released