we had this topic on HN before. i do not believe that many countries forbid individuals to take on a single long term client if they wish. they may have to do their own taxes and register as a sole proprietor of some sort, and in some places that may be complicated, but not allowing an individual to do that would be pretty restrictive.

the onus is usually on the employer. if the employer doesn't have an any legal entity in the target country they can't be forced to to employ that individual.

that said, some countries really don't like individuals to run their own businesses. is sweden one of those?