Of course, this is bad for financial privacy as you need to be KYC'd on Cash App for this.
But with Cash App, they do not charge for on-chain deposits, and then any spending / withdrawals you make via LN are free.
This means that even for small amounts of BTC you can do this and get 100% of the value of your UTXO transferred to LN, without there being any fees.
Thanks Jack!