Big pharma exploits people's fear of death or even being deadly ill.
Big Oil exploits our society's need to transport essential goods and to enable commuting to and from work. If you don't work, you don't eat and thus you die.
Big Tech - aka social media / advertising - exploits our need to be connect with other people and to be "respected".
If you consider Maslow's Pyramid, Big Tech is always going to play a lesser role than the other two.
NB it's "little tech" that actually enables the essential flow of information. But when you look at FAANG, they are all about advertising and entertainment. None of them directly provide essential services.