Almost everything. Important exceptions are housing, health care and education, which have large impacts on COL. But most else is cheaper.
It’s okay to hire an Indian fresh off the boat (with a visa) to code at Facebook (probably after an older or more expensive domestic worker is unhired) without a license but it is unthinkable that say public school teachers face the same competition.
e.g. housing: https://awealthofcommonsense.com/2021/03/what-if-housing-pri...