This sort of argument is very odd. Amazon can't justify putting the resources into building a golang SDK for AWS but it appears that Stripe can. Perhaps even more strangely, someone who works at Stripe can justify doing it on their spare time, but Amazon what hasn't got the money to justify it?

Companies that provide programmable systems should be the first to provide SDK's, even for technologies not yet widely adopted. That goes for any company that provides something programmable.

Amazon appears to have no trouble at all justifying the massive development effort required for every new back end web service they build, but front end programming API access just isn't valued as much.