Fast forward to today, and the cost of sending an ordinary paper letter in my country is now 3€. Lots of people would be reluctant to pay that time and time again, and forget about juggling a large number of pen-pals as people commonly did back in the day.
While a domestic pen pal probably isn't uncommon, the programs I recall tended to match you with someone international.
how sort of perversely lovely (i say it in an admiring manner), to meet in a gloriously old-fashioned manner on such a modern platform!
love it.