Using cash app to buy and send to cold storage

I buy btc on cash app then immediately send it to my trezor for the no FEE but theres a minimum. It says it can take up to 24 hours, I'm not worried about speed b/c I want to DCA and hodl. I send what I can when I can. check my balance on block explorer. Those fees don't come out of what I sent, so that means cash app is covering it and it goes to mining rewards. There's a small fee on purchase but free to send.