I’d say that consuming content that only confirms your biases is a form of failing media literacy as you’re failing to see the biases inherent to the content you’re consuming. There’s the flaw of “I think it’s this way” seeking out that content and not seeing that it’s poorly sourced (if at all) and eating it up.
Not to mention the role that content suggestion algorithms play in reinforcing that behavior and providing you with even more content along the lines of the biases you’re reinforcing.
It’s a complicated can of worms for sure.
My Mini Factory is primarily where I get mine (if you want a list of users I primarily buy mine)
Cults3D is another place but they’re a lot more hit and miss on quality IMO
The best models are purchased models (in general) though MZ4250 on Printables models are free and also pretty high quality.
Personally I won’t pirate models of people in the 3D printing mini community as I want to support the creators in that space as they’re not giant megacorps.