With everything said about the 'economies of scale' of launching startups in Silicon Valley, would do you think of startups in English-speaking developing coun

With everything said about the 'economies of scale' of launching startups in Silicon Valley, would do you think of startups in English-speaking developing countries? What are your thoughts on monetization(70%+ don't have bank accounts), market size(most use dumb phones) and relevance(i.e. Another whatsapp/facebook/airbnb? what for?)?