Perhaps. They do have a history of taking other translations and removing the credits. Making you think they did it. I don't think that's what happened here. Not unless there is another group that took a stab at it.
it's not all the time but a handful of sites that have "scans" in their name tend to have those long form comics That are paywall locked so I doubt any bother to double check and just get the easiest raws
To charge ppl with later
Esp the Korean sites I've seen like 4 different "groups" do the same title maybe they're basing it on the naver (Korean site) rating as opposed to something obscure others wouldn't bother to touch, even on the "official webtoons" altho some fan translations have been like 5 chapters ahead or slightly more accurate but those kinda manhwa sites can be hit or miss