For those who don't know about the real situation in the ground in the Philippines ( a bunch of posters have Filipina partners to check if wiki isn't clear in the matter):
The country is at the basic political unit, divided into Barangays, which must consist of 2000 registered inhabitants in a cluster to register as an entity. A cluster of Barangays forming 15000 people can register as a Municipality in the Provinces, which were divided up under Spanish era rule.
For the Spanish period, the interests of elite families in each Province were cultivated, ruling class Spaniards married into ruling class local families, blending both genetically & in the culture of subjugation of the lesser classes.
The American period brought along both a cargo culture & the advent of entrepreneurial capitalism & democracy, which created gaps in the preexisting power structure, which was absolutely brutal, but never supplanted it. There are consistently a handful of Filipinos in the Forbes 200 from the same handful of families which ruled the richest provinces in the country during the entire Spanish era, these are 500+ year old power structures.
Duterte is of a Royal Moro line, the southern Mindanao ruling families go back well before the Spanish era.
Across most areas you will also find either NPA or pretenders, collecting revolutionary taxes, doing standover, managing the drugs & sex business.
To the ruling classes in the Philippines, Rody Digong Duterte is no more than a big mouth Southern upstart who has bitten off way more than anybody can ever chew. If he really messes with them, he is either dead meat or there will be civil war.