Where do the #Youtube links originate from?
Are they in your posts, or whose, from where?
A whole lot of people are (rightly IMO) flipping out about the whole #Bluesky bridging issue, but let me tell you there are other content scrapers at work lately
Search 'Newsmast' and look at the profiles
They're a content aggregator scraping hashtags and grouping them into List "communities" under their own #Newsmast branding