Because they cannot be profitable. Job market is not the same on both ends. If you are east European and you try to get a job in an international corporation, the in all cases offer salaries adjusted for regional averages, unless you are willing to reallocate. Only few startups and FAANG like companies, often compensation in line what is received in the western world.
And there is also a thrill of doing it, which other guys already mentioned.
And there is also a thrill of doing it, which other guys already mentioned.