I would like for GIFs to be inserted into other GIFs on the GIF Maker.
However, GIFs inside of still images on the Meme Generator is an unnecessarily hard idea, because Imgflip would have to convert the still image (.jpeg file) into a GIF (.gif or .mp4 file). The Meme Generator is not built for rendering GIFs, so implementing this feature means rewriting a big portion of the Meme Generator code, which could cause lots of financial strain due to bandwidth.
But assuming I make the still image on Images-to-GIF maker, then this idea could still be implemented because the technology is already there. Imgflip would not have to do rewriting on the Images-to-GIF code.