I am always amused when the founder glorifiers accuse employees of feeling entitled, and proceed to rattle off the list of sacrifices which they don't realize everyone in the company must make in order to have success. Companies are a team effort. Good luck getting to 100-million-anything with only the founders' sacrificies.
That's the whole thing. As an employee, you agreed to the terms of your hiring.
When the company I worked for was bought out, employees with 401K's were given a sizable (but hardly enormous) contribution to that as part of the owner's sale. We weren't owed that, but I did appreciate it. But it was never promised to me and I was paid for the work I did.
Employees are not essential the way a founder is. That is obvious.