In the old days, it was also considered strange to give away your more personal property to a stranger for free. Diaries were private. Preserving privacy is just a normal thing people do. Technical literacy just shows you ways of doing so that others might overlook due to a lack of technical literacy.
Not everyone keeps their lives private. Even in the old days, people have published memoirs, zines, pamphlets, whatever. This isn't strange. Everyone wants their 15 minutes of fame, or in some cases, people chase the fame or fortune they perceive influencers have. Meta feeds on this psychologically. It doesn't help that students, farmers, union labourors, etc. don't trust their future is bright...
The point is, dismissing this as technical illiteracy downplays the research into the dark patterns that Meta employees to extract this info from users... As the charge suggests, Meta gets these photos “without obtaining specific consent and without properly informing them”.