Because other places have stronger social and family bonds (Africa, Asia, Latin America). Exceptions is the West and very westernized societies in Asia (e.g. Japan).

It's partly cultural (e.g. protestant cultures being more impersonal), partly because of necessity (you need more family/friend support in less developed countries), and partly because of the development model chosen (or imposed onto people) which sacrifices personal and social time and binds for productivity and consumption. Where western style productivity has not been applied (e.g. in vast expanses of global rural areas, non-factory cities, slower economies, etc), even the poor have plenty of social time. When that has been eroded and people are forced to factory work, sweatshops, or worse (mines etc), that drops closer to zero.

Quite a lot of social time was the norm in the west too, both in the pre-industrial past, and when a middle class emerged that overcame the Dickensian working conditions (e.g. sometime before WWII, up until some point in the 70s - late 80s or so. Thank neoliberalism/globalization for the changes...).