Even if this didn't happen, Big Tech would still know since you probably took your smartphone with you...
1. Privacy denied.
2. Privacy forfeited.
OP, I think, is complaining about the former. Though both forms could either be consentual or not. The latter is usually, in spirit, non-consentual: You agreed to the terms in good faith but wouldn't if you knew the unprecedented scale of the exploit.
Big Tech knows all about you personally, including your name, address, phone number, locations you've been to, people you've met, things you've bought or considered buying. And guess what: they will sell it to anyone who pays enough.