[onei]

I'm not sure if you've misunderstood, so apologies if this is old news. US companies may have teams of engineers in various other countries. But they almost always pay local market rate. In much the same way US companies will pay teams in India their local market rate (which is less again).

My last company paid 2-2.5x a UK salary for a US engineer. Perhaps the ratio for a company like Meta is closer, but I doubt it's equal. For startups you may find random roles that have equal pay globally, but they're relatively uncommon.