Because endless growth and data collection is the foundation of their business, and that necessitates doing gross invasive things to their users.
They need you to feed the beast, and they certainly don’t want you to think about it. So they use cartoon animals and sneaky happy paths to make sure you stay blissfully ignorant.
Using software is inherently a handshake agreement between you and the service provider. It’s not unlike paying for a physical service.
The problem is, many of the dominant software makers are abusing your handshake in increasingly dastardly ways. They treat their customers like sitting ducks — just a bunch of dumb animals waiting to be harvested. And when growth slows, they resort to deceptive and creepy tactics to keep the trend lines pointing skyward.