@Holo Some examples of sites with the locked paywalls thing (not all are necessarily manga sites, but it's more or less the same idea):
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YouTube: So first there was YouTube Music Key, then there was YouTube Red, and apparently now it's called YouTube Premium. Normal users get video ads. Also, YouTube Original series (longer, higher production quality videos) are locked unless you have Premium. For free users though, the first episode is usually available for free, but all episodes after that are limited to only short previews.
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Crunchyroll: An anime licensor/streaming site. Normal users get video ads, and there's a delay of a week before new episodes are unlocked. The Premium subscription basically just allows the user to watch the new episodes immediately. Also, both normal and premium users have to abide by region locks (although this is easily circumventable). Crunchyroll also has manga, where basically all of the chapters after the first one are locked unless the user has Premium. Also, non-Premium users get video ads here, too.
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Funimation: An anime licensor/streaming site. Normal users get video ads. Also, some shows are locked unless the user is a Premium Subscriber.
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SpotToon: A webtoons site. For each series, the first several episodes (i.e. chapters) are free, and subsequent episodes are locked. Episodes can be unlocked individually, or in an all-in-one bundle deal (i.e. all of the locked episodes in that series). If you unlock an episode this way, you don't get it permanently; it becomes locked again after 365 days. There is also a free rotation schedule on the site, where a subset of the locked episodes of a series becomes free on a rolling basis. When free rotation reaches the end of completed series, the free rotation will reset to the beginning.
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Manga Park (ja): Hakusensha's manga site. (Not to be confused with the other MangaPark.) The first several chapters are free, and the remaining chapters are locked. Chapters are unlocked using "coins", which users can purchase.
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Manga Box (ja): A mobile-targeted manga site/app from DeNA. Also has an English version, although the selection is much more limited. Not sure if the missing in-between chapters are actually available.
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Pixiv Comic (ja): A limited sample of chapters are available for free. Entire volumes can be unlocked to be read online by purchasing them in the store. A sample (usually the first chapter or so) from these volumes can be read for free.
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Comic Walker (ja): Manga site/store. Only the first several chapters + the latest chapter seem to be freely available. Don't know if it also offers the in-between chapters online.
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Gangan Online (ja): Manga magazine. Only the first several chapters + the latest chapter or so are freely available.
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Comic Meteor (ja): Manga magazine. Only the first several chapters + the latest couple of chapters are freely available.
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Kurage Bunch (ja): Manga magazine. Some chapters are freely available, others are greyed out.