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This setting is about links you tap, not links you post. It decides whether a one-tap trade in a group trades for you immediately, or just opens the coin. /settings → Group Links. It belongs to the profile, and it is off by default.

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The two states

With it on, the cap is yours. Whatever amount the person who made the link chose, your own auto-buy amount is the ceiling.

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What it does not do

Only you are ever affected by a link you tap.Nobody can trade for you without your tap, and nothing happens to anyone who does not tap. There is no setting anywhere in Dawn that lets one person trade from another person’s wallet.

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Should you turn it on?

Leave it off

The sensible default. You still get one-tap access to the coin; you just approve the amount. Costs you one extra tap.

Turn it on

For calls where seconds matter and you already trust the source. Set a small auto-buy amount first — that number becomes what a tap can spend.
With this on, a tap is a trade. In a fast-moving group that is exactly the point, and it is also how people buy things they did not mean to buy. Set the auto-buy amount to something you would be relaxed about losing to a mis-tap.