Why is remote trading not a thing?

My main issue with Pokemon go, above the money spending incentives, is that there's no way to remote trade. I'll never get region specific pokemon unless I happen to become wealthy enough to travel regularly. I understand wanting to foster community but remote trading can offer that too. And now I'm basically just shut out from those communities with an expensive paywall that Niantic doesn't even profit from. Like allow remote trading for 100 gold or something