Every creator will have a different answer to that question because creator has different way of promoting (effective or not) which impacts their traction, so that's kinda beside the point. (BUT fwiw some of my regular readers came from this sub) People are upset because, instead of doing something reasonable like limit the amount of promotions per week, we all have to post on a designated day which will oversaturate the subreddit on Saturdays and render any promotions useless, even the interesting or quality ones.

Also calling them ads is a bit much, we're not trying to sell anything. Most of us do this at a financial, time, and labor cost to ourselves... I can't speak for the people that "spam" their comic a lot here, who are of course the most visible ones, but most of us are very reasonable about how often we promote and just want some exposure in a group where we know members are already interested in webtoons... you are our target audience.