Other than the official webtoons themselves the paywall lock is annoying. And suspicious when like 4 of them do the exact same series at once lol (and i've seen some where a lot of ppl say they are a scam/where they did pay and still didn't get recompensated or so)
i mean, i'm surprised more ppl haven't been petty and contacted Naver/Kakao/etc and all the korean sites for their dmcas or so, i know a couple sites got shut down but i suppose some prolly would just change their names. I know Realm had some issues so they became Rizz Fables but ironically they're the only long-strip/Korean webtoon site that DOESN'T lock their chapters behind a paywall
But other than being like 20 chapters ahead or so they def shouldn't charge when a series gets an 'official' English b/c at least on Webtoon (as far as i know) the 'coins' you spend do go to the author as well (plus the app does actually let you read some chapters if you play an ad versus like mobile games that rly push you to pay), it does seem at least that MD seems to have put an 'upload freeze' on most of them