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What does the CashApp 1099-B report?  Does it report the complete balances transferred?  Or something else?

Review this IRS Tax Topic 515 that may apply since you considered yourself engaging in for-profit enterprise.

TurboTax Best answer states that TurboTax Desktop Home and Business would be required to claim such a loss but IRS form 4684 Casualties and Thefts is not yet available.

The loss appears to be reported on Schedule 1 Additional Income and Adjustments to Income.

IRS Topic No. 515 Casualty, Disaster and Theft Losses states

Personal casualty losses are losses from casualty, disaster, and theft that are not connected to a trade or business, or a transaction entered into for profit. Generally, if the loss is caused by a federally declared disaster, you may deduct personal casualty losses relating to your home, household items, and vehicles on your federal income tax return. For tax years 2018 through 2025, personal casualty losses are otherwise not deductible. A theft loss deduction is generally available, however, if the loss is due to theft related to a transaction entered into for profit. You may not deduct casualty and theft losses covered by insurance, unless you file a timely claim for reimbursement, and you reduce the loss by the amount of any reimbursement or expected reimbursement. 

Further it states:

Theft losses

A theft is the taking and removal of money or property with the intent to deprive the owner of it. The taking must be illegal under the law of the state where it occurred and must have been done with criminal intent. The amount of your theft loss is generally the adjusted basis of your property because the fair market value of your property immediately after the theft is considered to be zero. For tax years 2018 through 2025, individual taxpayers with theft losses are allowed a deduction if the loss is due to theft related to a transaction entered into for profit.