1099-K from Paypal for payment from small time sports wagers

My son received a 1099-K from Paypal for small time winnings from sport wager sites, such as Draftkings, etc.  This is done as hobby and not a business.  The total is under $2500 from 30 transactions.  However, they don't include the amounts he put in to make the sport wagers.  In other words, he did not make even close to $2500.  How would he report this in TurboTax in order to show the IRS he didn't earn that much in income?

I got to the Here's what to do with your Form 1099-K and it says TT doesn't need to create a separate entry for the 1099-K.  That's because it would already be included in other income, such as self-employment or rental income.  The amount indicated is from neither of those.

Any help would be appreciated.  Thank you.