You don't get it. It's not just FAANG and the risk adds everyday. Eventually some of those companies will go bankrupt, be hacked and the data will get in the hands of malicious actors and will be use to commit fraud, to blackmail, etc. Also even if it's used legally and 'ethically' it means things like: 1- we will pay you less because you only earned X at your last job, 2 - we will increase your healthcare costs because you bought a pregnancy test online.

https://www.opendemocracy.net/en/largest-personal-data-leaka...