Thats right, reddit is removing its horrible implementation of custom emojis, in its ever ongoing journey to lose all feature advantages it has over lemmy. Now we only need them to remove post tags and user flairs, and lemmy will be superior in every single way.
They are really deadset on removing every single community customisation out there!
Custom emojis are already a thing on the Fediverse, so maybe Lemmy/Mbin/Piefed will add support for them. I know that NodeBB already supports custom emojis and it can talk with Lemmy pretty well
That would be awesome