Would you consider someone delegating tasks to a personal assistant on a billable hours basis a multi-person company? How about paying a freelancer once for the initial design of the website? Both these tactics are discussed in "Start Small, Stay Small" a book aimed at single developer software product "startups."

It's pretty clear that if you want to shorten time to market, you leverage existing assets - when it's people using React or FLOSS databases, no one bats an eye, but farming out tasks here and there that aren't worth your burn rate (pay someone cheaper who can do it faster), how is that different?

When the government hires contractors they're not considered part of the government workforce (ie, civil servants).