So I finally emailed the staff since I couldn't find a clear answer, and thought I'd share the response I got. (I also asked about "wait for free" vs Full Premium since I couldn't find that either):
What do you guys think? On the one hand, it would be so exciting to get paid to make my comic, and be able to support myself at the same time! On the other, I truly care about my readers and would hate to suddenly make them pay for chapters (Hence why I asked about “wait for free)
My current comic “The Prince and the Raven” is a pet project of mine, I don’t know what else to pitch if not this. So I’ve been looking into other ways I can replace my part-time resturaunt job and still do comics. I know Webtoon featured series are free, you just pay to read ahead, but I do prefer the Tapas community and want to support it. What are some options you guys know of?