That's true, but at least Steam did not hide NSFW games from search/recommendations (if you had mature content enabled), which Itch.io did without warning. And I assume that NSFW games likely represent a far higher % of revenue/user activity compared to normal games for Itch than for Steam.
Mind you, the exact same situation steam faces right now, itch.io had been facing ~3 months ago. If the current state of itch.io is anything to go by, things are still likely to get worse for steam.