Some times it looks very silly how one country is burdened to the neck with sanitary restrictions, while its neighbour not so far away can be having none of that.
USDA inspection requires the US side to place agents in the country of export to do the inspection. The US, while making it legal, never did place enough agents. My guess is this was done via lobbyists for the Latin American exporters.
Also, I should point out that before covid I was able to find boxes of Alphonso mangos at some of the local Indian grocers, albeit very expensive ($70-$80).
Sanitary restrictions are up there against one type of fruit pests, but Malaysia, being an ex-British colony, has it much easier.
Agricultural exports are very dangerous if not handled carefully.
For example, I'm German. Up to September 2020, we exported lots of pig parts across the world... then we got hit by a single case of an infected wild pig, and since then we can't export much outside the EU any more.