How could you even suggest that rot13 is similar to one time pad encryption? They could not be more different. One is kindergarten crypto, while the other is mathematically proven to be unbreakable.
Advertisers pay platform owners to have sex with user data. That does not sound nice, but it's an analogy that most people can understand.
The advertisers are the Johns (paying customers). The platform owners are the pimps. The users are the whores. Once you understand that, things become crystal clear. The more whores a platform owner has, the more they can charge the Johns to fuck the data. Pimps fight over whores and try to keep them from leaving. They fight over territory too.
What you want? White males between 24 and 28 in the 12345 zip code who like sports cars and are college graduates. We've got 18,000 of them. How much cash you got?
It's big business. Smart money is on the G pimp. They own more street corners.
Violence is far easier and much less expensive. No need to hire a PhD in physics/math and purchase expensive equipment. Why bother? Violence is universally understood (no language barrier). All you need is a few guys who have no feelings. They could buy the equipment they need at Walmart. A few hammers and some pliers. Job done.
200 years ago, every man could own a rifle and all rifles were assault rifles. Citizens were equal with their governments. They could ban together and form armies. Today, looking at the vast differences between arms that governments posses versus what their citizens may legally posses and you'll soon realize that the only technological equality we have remaining is strong encryption thus the governments attack that technology accusing everyone who uses it of being either a state sponsored terrorist or a child porn monster (why else would anyone use it... what do they have to hide). They themselves use encryption extensively, but they don't want me and you to do so.
The United States once classified some encryption algorithms as a munition and banned exports. We citizens can't buy tanks or air craft carriers or satellites, but we can legally use AES 256 encryption (at least for now) and we should. That's all we have left.