“So if minors sent naked pics to each other Twitter is viewing and saving those images on their servers.”
If they do not view them there is no crime.
If they view them and save them, it is a hell of a crime.
Sounds like it sounds like it is systemic to view whatever messages that are sent. Unless if they have a company policy to never look at what minors send, then it sounds like a lot of kiddie things are being viewed by their staff.
This guy says they are saving it. They have teams of hundreds of people to look at these and save them.
https://www.projectveritas.com/2018/01/15/hidden-camera-hundreds-of-twitter-employees-paid-to-view-everything-you-post-online-including-private-sex-messages/