I don't work for "a company". I work for one of several companies, depending on the week/month, and sometimes two or more at the same time.

Personally I prefer shorter contracts, but I have constant offers of longer contracts, so I could go that route if I wanted. But I also want time to work on my own projects.

Though, in the abstract, sure, it's not always possible. This is advice along the lines of "Be Really Awesome and Have an Excellent Business Network." Not everyone can really follow it.

But there are a LOT of freelance jobs floating around right now, so it's a good time to give it a try if you can.