The answer is money and eliminating competition for money

It’s an awareness thing. Everyone uses it because everyone else uses it, because it’s the main one people know about, because Meta has unlimited money to market it and scale it, which are exorbitantly expensive.

Hey get a load of this guy, can’t even expose one lousy US war crime. He’s basically complicit

Some TVs have tech called ACR (Automatic Content Recognition) that literally reads pixels on the screen for identifying information about what content is being displayed. If your TV has ACR enabled, it’s possible it’s tracking what you watch, even if you’re viewing it through a device like Chromecast.

If your TV doesn’t have ACR or the TV itself isn’t connected to the Internet, then you’re probably fine.