[killdozer]

In a LOT of cases it's neither short term or temporary, you would be surprised how many temps/contractors/vendors/whatever at these companies have been there for years, sat at a desk in their buildings, learned their tech stacks and developed products, ate lunch at their cafeterias, etc....

[blindriver]

The IRS ensured that contract workers cannot work at a company for more than a certain amount of time before they are automatically turned into employees. That's why companies rotate contract workers off jobs when they hit a certain time limit.