I think this allocation of blame is unfair. I moved from a developing country - the plastic culture originated from the west. The difference is that developing world does not have the massive taxpayer funded garbage collection that is present in the west. And does not have the rigorous fines for fly tipping. And cannot pay other developing countries, like Philippines, to illegally take our trash.
Westerns norms are to offload the trash problem onto the taxpayer - we just don't realise we are subsidizing PepsiCo. The problem is hidden. And in India/Vietnam/etc. the taxpayer can't afford this subsidy, so the problem is plain to see. But both societies suffer.
Once western industry adopts single use plastic everywhere, it is really difficult for a small developing country to avoid it. Firstly, half the products consumed in developing countries are produced by western companies, or designed by western companies and produced locally/in China, say Coke bottles.
Even if you consider local manufacturing, imagine you are starting local production of cheese or whatever. You are going to import western industrial machinery, that is setup to package things into plastic. You are going to hire western consultant to help you configure the production line. You will import western best practices. You might even have to import packaging materials.