How exactly do you think Facebook/Meta makes money? Good feelings? Likes/thumbs up? Meta is exactly like Google, like
any other service you access for free on a daily basis; their revenue is pretty much all from advertisements.
There's literally a setting in Facebook where you can tell it to deliver less personalized ads, but it's all still cross-linked to some degree with other services all the time. Have you never seen related Amazon ads in FB to what you've recently purchased?
It's been proven that while Facebook isn't audibly listening to you via mic, it gathers data in plenty of other ways, often extremely voluntarily. People use their Facebook to log into other sites/services all the time for convenience.
Spotify is a digital music service that gives you access to millions of songs.
gimletmedia.com
Are you that new to the internet?
NOTHING that is free is actually free.