I don't necessarily have a question about this, but I thought it was an interesting thing to bring up since I've seen a lot of discussions before about how webtoons makes money. Recently they posted an update to the terms of service, and the ad thing seemed to be the most significant change. I'm guessing they're introducing this feature to make their business more sustainable. Who knows, maybe they'll also be able to use the revenue from it to continue supporting creators like in the form of the patreon pledge thing. One can only hope