YouTube is actually the least engagement-driven/addition-maxing social video provider, by far. Meta and TikTok are famous for discouraging external linking, limiting reach to non-targetted users, heavily moderating content to match engagement metrics, disguising advertisement as content, etc...

YouTube for the most part just serves what you post, does minimal content moderation, stuff a dumb insurance ad on the front (of the long-form content) that looks like a dumb insurance ad, and then does it for everyone else. I mean, sure, they could do better. But really if the world of amateur video content was all YouTube it would be a better place.