Employees with irregular hours are a thing, and were even moreso before the trend of forcing them into more precarious designated-as-contractor-roles (often contrary to labor law) became popular with the “gig economy”.

Note that I never made any claims about whether it's actually better for every employee, or even the average employee. I was only responding to your claim that "Unless you are a shareholder of the DSP, this isn’t a benefit". Moreover, I'm skeptical your claim that people are being "forced" from being employees to being contractors. At least when it comes to restaurants, the DSPs were basically servicing restaurants that didn't do deliveries before. Therefore it's highly unlikely that anyone who was previously a delivery employee was forced to switch to being contractors, because those jobs didn't even exist before.