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Curious to know if fee sharing is staking-based or all token holders share in the fee irrespective of whether they stake or they don't.

You just keep your coins on the exchange to earn the fees.
If you hold off the exchange they provide instructions on the Dashboard so you still earn fees.

Thanks @g-dubs. You mean holding off the exchange also earns you fee-share? That's awesome :D

Yea you just need it connected correctly. I haven't tried it so I just leave my coins on the exchange.