Maybe I'm not familiar with how equity works but this seems to have all sorts of weird properties like how after 5 years the amount of money you would get start

Maybe I'm not familiar with how equity works but this seems to have all sorts of weird properties like how after 5 years the amount of money you would get starts to decrease (assuming that the total number of units rises, which in this system it is almost assured to), the amount of money you get decreases as more people join, and if you leave you get nothing at all. The cap on what percentage employees get seems weird to me and it really messes with the math in a way that seems to screw the employees.