After googling and reading some articles, that doesn’t seem to be true. According to Webtoon, they make contracts with creators, which seems to be between 48.000 and 50.000 dollars a year on average. For example, the contract would state that the creator is to deliver 50 episodes per year, with a 1000 bucks per episode. If the series incurs any losses and makes, for example, only 45.000 in revenue, then the creator still gets paid the full 50.000. That’s including fast pass. So, in this example, Webtoon would make no money on the series in that year.
Again, 50k is only an example, it depends on the contract. The numbers in other articles are all over the place, I’ve seen reports of as low as 38k.
This doesn’t include “international (non-local) paid content revenue, advertising revenue, or merchandising revenue.” Which means that creators can make more than their contract states, even if the episodes themselves don’t meet the contractual revenue.
Webtoon also has an ad revenue sharing program for creators that hit a view minimum requirements. Through this program, creators get 50% of all ads displayed on their series.
Please keep in mind that this information may not be 100% accurate, but it is the most reliable info I could find in a few minutes, since it’s mostly from Webtoon’s own homepage and a few third party sites.
In any way, it’s better than not getting paid for your work at all.
I assume it means that it’s injected weekly in four to six week intervals, with breaks in between.