There’s a whole vibrant industry of people you can pay to market whatever you want on Reddit. They can’t all be competing for the same few popular subreddits. They must be differentiated by targeting niche subreddits.
You say "sudreddit". Marketing teams say "self-selecting target segment".
The first one sucks for a multitude of reasons, the second one you basically don't notice are ads, yet they're all over reddit.
Can't say I know how it looks everywhere on reddit, as I'm not everywhere on reddit, but the AI subreddits I referenced earlier are filled with it, and I've even received offers myself to get paid to pay about stuff and I'm a nobody, so surely I only know of the surface.