I don't understand why people don't have a problem trusting Google with all their information (as is the case if you use Gmail). Even if you ignore the privacy

I don't understand why people don't have a problem trusting Google with all their information (as is the case if you use Gmail). Even if you ignore the privacy implications and the fact that it's a company whose business is to target ads, there is still incompetence. Case in point: my YouTube history regularly gets mixed with somebody else's. I get videos watched by a child that likes Masha and the Bear and Peppa the Pig. Reported to YouTube a number of times, they seemingly ignored it and don't care. I turned off my history, but I still get recommendations for Masha and the Bear. Now, that purchase history of yours, who else gets to see it?