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Over on the linked page? They’ve got custom “emojis”, which are just pictures uploaded by an admin. Lemmy has that feature in general, but it’s not used much on other instances. If it’s enabled on your instance, you can type :
to select from all regular emojis plus custom ones.
The userbase is small enough that hashing would be easy cracked by a determined person. Even with salting, iterating through the entire userbase and hashing each username+salt to check for a match would probably not take long