except for flooding you with more ads between video recommendations
That’s literally it. The advertising and marketing teams within Google have politically maneuvered themselves into running the show, and the software/product engineering teams that want to maximize the quality of the system they work on (search, youtube) are overridden by insipid metrics that advertising needs more user interaction with ads.
They literally have been commanding that things be made more shitty to optimize their malformed metrics. You absolutely can get more people to click the sponsored search results… if you keep making them less distinct from the actual results. And advertising needs those good click through rates nooooow!
There are email chains documenting this sort of shit going on that have become part of the public record due to various court cases.
So… money laundering and a tool for storing assets in non-liquid form, as usual with the high end art world.