Why does everyone say side hobbies can't make money until you're already rich?

It's so frustrating when people act like side hobbies are only for people who already have time and cash to burn. Like, sure, if you're sitting on a trust fund you can afford to knit scarves for fun and "monetize" them later. But what about the rest of us who just want to turn a random skill into actual income?

I've been trying to turn my junk modeling habit into something useful, but every "guide" assumes you've got a workshop and a Patreon already. Anyone else feel like the advice is always 10 steps ahead of where you actually are? What's a hobby you've actually monetized without selling a kidney first?