I remember there was a Lezhin portal in Japanese. I haven't been there in a few years. I'm not sure if it's still there.
I remember when XOL was closing down, the Japanese readers were NOT happy with that. They wanted read more Tower of God and Noblesse. Now they have to pirate it.
Webcomics took, what, 20 years to get a foothold in Japan after webcomics become mainstream in Korea. Partly, because the Japanese publishers and artists hated the format because of piracy.