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YouTube is cracking down on clickbait
(www.theverge.com)
This is a most excellent place for technology news and articles.
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.