You get Founder Liquidity because you managed to convince people who do just as much work that they couldn’t do just as much work without you. LOL
I am so cynical.
Generally they make more decisions that directly effect the odds of the company existing 6 months or a year down the line than the average employee does (with some exceptions obviously).
You can still be cynical, I think all employees should be given the ability to get liquidity early, but it's not like it's totally unjustifiable.