I started doing the same thing on strike, it just transfers from the bank whenever it buys, you could probably deposit a lump some each month and draw from that too but to dca direct from bank charges no fees after the first buy. I doubt it matter to the bank, now a days it is all electronic and they are probably reporting any amount of money sent to any exchange anyways, so as long as it doesn’t freeze up my account, I doubt they care that deeply either.