@Gaerek for this specific app, or most of the manga apps of this kind, they are content "free", you get a currency you can use to rent chapters for 72 hours, that currency you can either purchase it or get it by watching some ads or doing some other stuff inside it (like read these actual free chapters of this manga, and you get x amount of points), beside sometimes having a daily use one, that you can use to read 3 chapters or so (usually you can use that one up to a specific chapter number), other apps use tickets, or just watch some ads (like ganma), there is other apps, that put latest chapters with a pay only currency, but they eventually get moved to the "free" one,
This one app got 2 different type of censorship, is always either this one with the big black bars, or is that white fog that you usually see to cover key points (nipples/crotch area)
And if is for this specific publishing format, mm, i think so?, i have alot of manga apps from different publishers, and so far most of them are censored to some degree, and the censorship change between app, sometimes is dumb shit like this sometimes is just cover key points, probably is just a thing with app/web manga only in general