As always, the spying agencies are NOT particularly interested in your actual messages, but your metadata.

They want to know who talks to who. Limited data? What a bunch of horseshit.

"Limited" is a weasel word, as it can mean anything. e.g. a "limited time offer" can mean it lasts for 2 days or 2 years, because it is not unlimited.

Likewise, sharing a limited amount of information with Facebook simply means they don't hoover up every single bit. Perhaps Facebook is not interested in those automated texts you get confirming haircut appointments...

On the other hand, if you just got a haircut, then they know that you’ll be looking for another one in a set amount of time (based on your hairstyle, which they also know from photos), and they could advertise hairsalons to you then.

I’m not sure their algorithm is this refined, but it’s not impossible.

E2EE is indeed true with Whatsapp, but they can distribute the decryption key to anyone, including themselves.

These advertisements with half the information about the technology should be illegal.