$5000 is the median checking account balance in the US. CBDC account caps at less than this amount would be required to avoid significantly cannibalising commercial bank deposits. This was already put in place by the central Bank of the Bahamas in their sand dollar initiative.

Identity verified CBBC accounts are capped at $5000 annual balance and non-identity verified accounts are capped at 500. So that's quite a low amount, and again raises questions about the future of commercial banking under CBDC regimes.