Indochina is Asian Latin America. Except instead of Spaniards you had Chinese people as the immigrants. The countries with the highest admixture of Chinese are the most prosperous. Basically Chinese in Indochina are like Jews. The people ruling these countries do not have an ounce of patriotism or loyalty to each other outside of trade relationships.
Singapore is developed because it focused on its manufacturing and human capital potential after it gained independence from the UK and established itself as a tax haven for foreign investors.
Cambodia has kept the same regime (Khmer Rouge still technically in power under the new government), since the UN invervention in the 90s, although it might change soon since the system is crumbling under the weight of its own corruption and some of its pillars are getting too old to rule and they know it.
Laos has remained an isolated authoritarian communist regime.
Vietnam has been booming since the introduction of the Doi Moi Laws in the mid-90s (equivalent to the entry of market economy in China; they did that as well as remove the centralisation of produced goods in cooperatives, and allow privately-owned businesses) and the jury is still out on whether the ruling communist party will take strong counter-measures or continue to liberalise until there is no traces of communism.
Myanmar isn't really as poor as it used to be ever since the junta lost a lot of power. The only real issue is the Shan State and I dont think it'll be resolved anytime soon. If they can get over this Rohingya mess than as it stands now, Myanmar is in a position to at the very least reach Vietnam level of development.
Thailand is in a worrying state since the last military coup allowed the army to seize power after the democratic regime fell due to its ruling class becoming self-serving, the mix of this authoritarian turn and the death of the only stabilising force that was King Bhumibol, followed by his much disliked son are not good signs at all.
Consensual prostitution is widely practiced in Buddhist Thailand because of the view that the body is just a temporary vassal before the next reincarnation, thus sex is not that big of a deal. Thailand also has the highest infidelity rate in the world for the same exact reason, and underage mistresses are not uncommon for old married men.
The Thai borders with Malaysia and Burma (and to a lesser extend Cambodia) are among the most dangerous places in SE Asia due to the sheer amount of smuggling of goods and human trafficking that goes on there, with the full complicity of the Thai authorities.
The Philippines are confused from generations of rape by the Spanish and Japanese. They use whitening creams and go to Catholic Church except for the few native/tribal remnants and the rebels in the south-west. They pretend to be religious/conservative but the population density + catholic "no birth control" devalues labour to the point that a large portion of the population has to travel abroad to find work. Philippines has the lowest average IQ in SE Asia which largely explains why it is a corrupt third world shithole.
There is an enormous number of poor single mothers in the Philippines and most of them have been impregnated and dumped by filipino men. There are some children, especially around Angeles city, that have been fathered by sex tourists. Not all of them are old white sex tourists by the way, there are babies born there from African-American and Hispanic sex tourists. Mass sex tourism and prostitution exists there because the Philippines is and always will be a corrupt third world shithole. At the end of the day it takes two to tango, filipina sex workers have some accountability here. They decided to work in the sex trade, they decided to fuck without condoms because they just wanted the money. Now those children are portrayed as victims by the liberal media.
https://i.imgur.com/jnPOMan.jpg