Never heard about peanut allergy here in India, looks like a first world problem.
It largely is. That is, globally peanut is among the most common severe food allergies, but it's still fairly rare. But in the developed world (IIRC, particularly the US) popular guidance to mitigate the risk of peanut allergies in very young children (who can't communicate symptoms.as effectively, so, if they have an allergy, are at greater risk of consuming more and/or having treatment delayed) was to avoid any exposure.
It turns out that that guidance actually increased the incidence of severe peanut allergies immensely, because it made it much more likely that when people were exposed later, they would develop an allergy, and peanut allergy is far less common where children are usually exposed at a young age.