I would be shocked if the timing on this release wasn't at least tangentially related to sponsored posts.
I think this is going one of two ways: Either the official client is a quick bid to incentive Microsoft to remove 6tag the same way Microsoft replaced their YouTube app with a gutted one, or Instagram think their official client is going to rapidly eclipse the "knockoffs" and they won't have to worry about it.
Keep in mind that while Microsoft did cave on their own YouTube app, it wasn't in exchange for nothing at all. They still got to keep a gutted "official" YouTube client in order to fill checkboxes in pundit comparison reviews.
I think this is going one of two ways: Either the official client is a quick bid to incentive Microsoft to remove 6tag the same way Microsoft replaced their YouTube app with a gutted one, or Instagram think their official client is going to rapidly eclipse the "knockoffs" and they won't have to worry about it.
Keep in mind that while Microsoft did cave on their own YouTube app, it wasn't in exchange for nothing at all. They still got to keep a gutted "official" YouTube client in order to fill checkboxes in pundit comparison reviews.