RE: PolyCub Information/ How To Claim FREE LARYNX Tokens/ Splinterlands Daily/ Chaos Legion Pack Opening + Lore Showcased

That same link above has the below info.

You can: hold them, send them, trade them.
If you are running a node, stake them to earn fees to help others trade them.
Four-week power down. 25% per week.
The fees earned by node operators are a share of the DEX trading fees

Nodes that earn a share of the dex fees have to be in consensus. To be in consensus the node has to stake more larynx than the governance threshold on the SPKCC Monitor page

Looks like the above is current rules (So going by the above information the answer to your first question is you need to be running a node to earn a share of fees). Currently I'm in the hold without staking club.

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