> mypostcard in 2016 claimed that they print 10000 postcards per day
I wanna call bs of this claim. Postcrossing -- largest postcard exchange community, almost 800k registered users worldwide, not all active of course, but a large portion of them sending daily and are really hooked on the hobby.. The hottest month in 2016 was March, 17k/day. These are people who love sending cards. Just hard to believe another single service not oriented on hardcore regular senders would be doing even half that. I can be wrong, of course, but just hard to believe.
how many of those "letters" are postcards? thing is postcards are not cool anymore (sad), and I think postcards share of the whole volume is pretty small.