Putting stickers over your cameras might be a reasonable thing to do, but it's pretty silly to pretend your threat model is the same as Mark Zuckerberg's.
There’s also people looking to crack huge swathes of the population, but state level actors seem more interested in breaking key individuals for blackmail, and espionage.
Although some state level actors are interested in mass surveillance as well.
Tl;dr: yes, Zuckerberg has more to worry about with his devices than the average individual.