I mean, yeah, I'd agree. My personal experience has been that, despite getting very lucky with having front page features on both websites, making constant updates that are a good length and a good polish, and in genres that tend to do well on both these sites, and having a really wonderful engagement from readers, it's been very difficult to grow on either site. I get spikes of growth when a feature happens--and then a slow trickle outside of that. There's just a lot of people making webcomics right now, and readers are easily distracted. They sub a lot more often than they read, and I'm pretty sure most that I get from a feature forget I exist a week later. Would really love an improvement to my library on either site, one that encourages finishing a comic as much as they encourage subbing.
But like, I think there is a ceiling to what you can get from getting featured from staff. Like my online presence is small, and I need to get more twitter/insta/tik tok followers or I am relying completely on front page features--which isn't a position I want to be in any more. Like there comes a point where you will always have to go back to that marketing grind, like you would if you had your own site.
I just think webcomics are in a weird place right now, and I don't know what the future of these aggregate sites will be, or if they will always be creator friendly or as creator friendly as they supposedly were 5 years ago (which like I've only been here for 3 years so I don't really know from personal experience), but I mirror my comic on either site becuase I just don't want to make my own website right now, and start over from literally nothing.