I wouldn't know what their current situation is.
When we started they had a pretty basic boilerplate hosting agreement... We left when they started to expand their side of the agreement to include things we were not comfortable with such as assuming IP control. I know they backed off that stance after a bunch of creators left.
I wouldn't be comfortable guessing if Webcomics App sees much a difference between IP rights and as they state it "ownership rights of proprietor's content. Could be exactly the same thing or they could legally think there's a difference.
Sorry I am not more help.