If there is one thing I can't stand, it is people on here who tell others posting about topics they're not interested in to “use a content warning”. Mate, if you would rather not see posts about Substack, or any other topic, YOU CAN FILTER OUT POSTS.
CW's are extremely valuable for handling sensitive topics, particularly ones which affect minorities. They're not there to act as filters for stuff you just don't like. And by demanding that people use them like that, you undermine their value.