> the company usually needs to create a subsidiary in the country of the employee, get familiar with their judicial and tax system, then there's also the issue

> the company usually needs to create a subsidiary in the country of the employee, get familiar with their judicial and tax system, then there's also the issue of time zones, travel cost to company meetings, etc. This is why women who want to get pregnant don't get hired in the USA (extra costs associated with postnatal (ETA: maternity) leave). And yet that's not okay. So your basic rule of thumb is not quite comprehensive.