Many ownership agreements come with limits. Some stock funds limit how much people can withdraw each month. Home "owners" associations put plenty of limits on what people can do with their "property."

Do you think that some magical worker-owned cooperative would let people sell? No way. I know folks that worked at a vegan restaurant cooperative. They wanted to get another job-- but the cooperative wouldn't give them anything. Why? If they weren't working each night, they weren't going to get a percentage of the business they built.

There are good reasons for lockups and, of course, you don't need to take the job.