Google Playing Videos In Overlay In Search Results Can Reduce YouTube Engagement
Briefly

"The issue is that you don't get the subscribe or like buttons, or even the ability to comment, on the Google Search video overlays - you do get views and ads in the videos but not the other engagement signals."
"We are assuming that this interface with product ads will almost inevitably lead to far less clicks through to our YouTube channel. YouTube is very important to our brand and people subscribe on our channel page."
Read at Search Engine Roundtable
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