You pay 7.65% FICA tax
They pay 0% FICA tax for 3 years

MATH:
You: $200k - $13,818 = $186,182
Them: $200k - $0 = $200,000

$41,454 EXTRA = their down payment on your starter home

100 foreign workers = $4.1M extra buying power
Your taxes fund their housing advantage

This is why you're getting outbid
This is legal replacement