Asymmetry is common in startups, though. Consider one of the complaints from the article, and discussed here: founders get to keep several tens of percent ownership of their companies (at least initially), while early employees get a small fraction of a percent. Founders are generally not taking two orders of magnitude more risk, or doing two orders of magnitude more work.

I think giving founders liquidity but not employees is maybe ok for series A: the founders may have been working for $0 for a couple years at that point, and may have taken out a second mortgage or ran up a bunch of credit card debt to keep things going. An early employee is not going to do any of that once they join, even if they're getting paid a below market rate salary. That is definitely an asymmetry! Getting some liquidity at the series A allows the founders to pay down debt and replenish their savings, financial issues that are probably directly related to their time working on their company.

But after the series A, founders should be able to pay themselves a livable salary. The founders and employees should be on much more equal (or at least comparable) footing when it comes to their regular income. By the time the series B comes along, if the founders are going to get some (more) liquidity, the employees should get some too. That only seems fair.