Although the subscription thing keeps coming up, I think it's good to remember that most so-called free-to-play games are really freemium where you have to pay up in some hidden form to get much from the game or to progress beyond basic content.
For Might & Fealty, once you've paid the subscription you're on a level playing field with everyone else. I think it's also been suggested that the subscription fee will be fairly modest. When promoting the crowdfunding, I think those are things that it's important to point out to people if they ask why the game won't be free-to-play.