I'm from a first world country in Europe and I can count the number of spam calls I got over the years on one hand (literally 2).
Same goes for spam texts (3).
For legal reasons my phone number could be found on the open web for years.
With a fairly wealthy population (by world standard) and a language spoken by ~100 million people there should be ample opportunities to spam people.
Yet even my parents whose number were listed in the phone book get maybe 1 or two spam calls per year