You may have heard someone from the US state that they work two or three jobs. This is not uncommon, it is known as gig working or side hustling. Most reputable companies will cover their staff for vacations, healthcare and workers insurance. Gig working does not cover any of these things. Construction work and domestic work is gig work, this leaves the worker exposed in many ways, especially construction work, where accidents happen all the time. Health care costs in the US are incredibly expensive.
W Kamau Bell covers this is his series The United Shades of America. He interviews gig workers, some of whom work six jobs, not because they want to, but because they have to.