All Google is worried about is whether or not people actually like the video and if you can simulate this with bots, that's most likely why it's working.
I think it is not as simple as that. Google is using a number of factors in their search engine searches. Basically it is a combination of maths equation that factors into social signal, backlinks, backlinks of backlinks that are related, visitor count, visitor shares, etc. The exact formula is not made known but these are the basic ingredients.
You have to update attractive Title & Description for your YouTube videos as well as share them over social networking channels to increase its user engagement. https://bit.ly/3Q9Gsad
Select a great keyword.
Include accurate closed captions.
Add a transcript to your video description.
Offer subtitles in multiple languages.
Write a keyword-optimized title, description, and tags.
Say your target keyword in your video.
Use a compelling thumbnail.
Add cards and end screens.