Well, it makes sense that now that they are back on their own feet they need a way to monetize it.
Discourse Gifs does not use their SDK, only their API, so it looks like that in order to use Discourse Gifs with Giphy from now on staff will need to pay $120 a year.
Good thing @merefield and @tnoor-co added support for Tenor. I have changed Meta from Giphy to Tenor preemptively.