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Same reason we have debit cards with parental controls.

If I lived in Chicago, I'd put my Ventra card on my kid's smart watch.

If you read the the "4" footnote included in your copied section...

> Requires compatible payment card and internet access. Payment cards for supervised users may require a separate paid membership (not included with Fitbit Ace Pass). Payment card memberships or parents may restrict purchases of certain products or from certain retailers. Supports Tap to Pay only.

Tap to pay with spend controls sounds ideal for things like after school snacks/activities and transit. It could also be an easy to way to manage things like allowance digitally?

Some urban transit systems use NFC for fares. Maybe you want your kid to have a bus or subway pass without having to carry a wallet.