One major difference is that in some countries (many EU countries) payroll taxes are much higher than in the US, where most income taxes are paid by the individ

One major difference is that in some countries (many EU countries) payroll taxes are much higher than in the US, where most income taxes are paid by the individual. So while your quoted salary is lower, the cost to company difference is less stark - your country just makes you pay higher taxes. Another difference is that tech companies are expanding into countries like yours precisely because it's cheaper to hire people. Not to be an asshole but you see this in the types of projects that cheaper countries get in large multinational tech companies compared to the major hubs too - less direct product work, more things like internal software, tooling, data/devops pipelines, etc.