Jimmy Donaldson, a.k.a. MrBeast, has an expectation for departing employees that lawyers say goes beyond the norm. Prodip Guha/Getty Images

MrBeast has an unusual expectation for departing employees: The world's top YouTuber doesn't want them to post about him — even if they're saying nice things.

Employees leaving the company of MrBeast, whose real name is Jimmy Donaldson, receive a letter outlining their obligations, including an "expectation" that they refrain from creating, commenting on, or engaging with social posts involving Donaldson, his company Beast Industries, or any of its employees.…