YouTube will never “crack down” on these guys. They are their money-makes and can do whatever the fuck the want. Clickbait on huge channel is YouTube’s bread and butter, even if people just click to comment that the creator sucks, that’s still engagement and means there is more money in the ad bids.
I think you’ve correctly identified their self-interest over altruism, but you’ve misidentified the internal value of discouraging clickbait. YouTube is a treasure trove for building training datasets, and its value increases when metadata like thumbnails, descriptions, titles, and tags can be trusted.
It’s the AI gold rush; notice how this coincides with options to limit or disable third-party training but not first-party training? It coincides but is definitely not a coincidence.