I mean, that’s a good concept tbh.
Thing is, Imgflip wasn’t meant to be a social platform. Originally, it was just a meme generator. With the rise of streams, however, people began to form communities and now it’s more like a social platform. I really doubt they’ll add Reels. It’s a good concept, but yet another thing is that Imgflip is a bootstrapped company. They use whatever ad revenue and paying users to maintain Imgflip. Server hosting is expensive work, and using what little they have to fund more terabytes of data (hence, videos) will be tough for the Imgflip staff.
Welp, hope this helps.