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Another great option would be to give awards (kinda like how reddit does it). Instead of a tip, maybe we can give "gold" or "silver" or some other icon reaction to a comment/post. The cost of the reaction/award goes to the user.
A cute alternative could be a Mjolnir hammer 🔨 (a better one lol), a thunder icon ⚡️, an axe 🪓.