Gusto also has a company bylaw where they can veto any employee sale. Not Right of First Refusal, but can flat out veto an employee selling stock to buy a home, pay off student loans, start a company, etc.
This isn't covered at the time of hiring, nor present in the option agreement provided to employees.
As an early ZenPayroll (now Gusto) employee and a leader of the culture up to 70 employees, I'm honestly embarrassed by the company's stance here. It's hypocritical (in my opinion) to the values talked about by the company.
Employees should benefit from the success of the company they worked hard to build. As a current founder, believe me I understand why founders get a much larger share. But at least be transparent.
You can read about our approach to equity, and everything else, here: https://octopoedi.gitbooks.io/employee-handbook/content/