@Tusky I'd vote for consistency with the web interface. It's weird that custom emoji will render as the instance owner defined them, but not the regular emoji.
Could you progressively backfill emoji in cache (from the instance itself? similar process as custom emoji?) over time if the user chooses instance emoji instead of system emoji?
Or a single bulk download post-install of twemoji, that warns the user first when the toggle the option?
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