At least for the forseeable future, Facebook isn't going to wall off the service, which makes money from branded content, for its exclusive use. “We will continue to make Giphy openly available to the wider ecosystem,” the Giphy team wrote.
You'll still be able to upload and remix your own GIFs. Developers and Giphy's API partners will also still have access to the massive GIF library, as well as Giphy’s stickers and emoji. Those partners include the likes of Twitter, Slack, Skype, TikTok, Tinder and Samsung.