Since this information is readily available on google and I'm preeeettyy sure I'm not violating my contract letting you know, but 2,000 a month is the base pay for any Featured artist. The bare minimum. Realistically the popular ones are making much much much more off fast pass/ad revenue.
I think at this point if someone is serious about making a living off of webcomics and are not already premium on some other site or have a site that already receives a ton of traffic (like awkward zombie or something) then they're shooting themselves in the foot not uploading to webtoons. The monetization for even people on discover/canvas is waaaaay more than any other site.
I find this honestly an amazing change, growing up I never thought it'd be possible to make money off of webcomics (or even comics in general), but the tide has shifted and it is a VERY viable source of income now.