They definitely exist - quite a lot of them in fact - it’s just after the big migrations in 2022, the kind of people who tend to get popular on Mastodon are the more “serious” posters, as they’ve eclipsed the memers in popularity. (Eternal September kind of thing)

If you check out the explore and local feeds of instances such as Wet Dry World or Beige Party, you’ll find the meme posters, who you can then follow.

What doesn’t help either is that meme posters never use hashtags, even though they’re the primary way to be discovered on Mastodon. On the other hand, people who are posting “serious” takes tend to use hashtags a lot - this also helps skew the meme posters away from people. Unfortunately, hashtags have gone completely out of vogue and just aren’t used by most people.

Mastodon is implementing full text search soon though, most likely with 4.2.0 (the next version), which should hopefully make things easier.