Rule two: every transfer costs a fee, and it is the same fee for ten dollars and for a million.
You pay per transfer. The amount plays no part. The fee moves with the network, so the app quotes it fresh each time and shows it to you before anything leaves. Typically it is a couple of USDT to move a hundred, or a million. Yes, a million. The network does not care, and it has never been impressed by anyone.
One case is predictably higher: a brand-new address. An address that has never received anything has to be opened on the network before it can hold money, and whoever sends the first transfer pays for the opening. That would be you, once.
FROM HOW IT WORKSRead the long version