Ask them if they lock their tune. If they do, you can't take it to another tuner if you are not happy with your first tuner as the first tuner will charge you to flash a stock tune back into the car and unlock the ECU.
Dude you have EFIlive FSV2 right? You and I can swap and edit unlocked tunes but why would it be an advantage for someone who doesn’t even know how to speak to the tuner to ask what he would like?
OP there are two main flavours of engine management editing software - EFIlive and HP Tuners. With both you pay for a licence of the vehicle’s ECU, about $250.
With EFIlive you only pay once per tuner you see, and the details of the calibration are locked to the tuner’s equipment. This is because it is a commercial service with proprietary information.
By comparison leaving the tune unlocked for anyone to read and resell and upload to a tune repository (sort of like pirate bay for cars) is ludicrous, professionally irresponsible and dangerous.
In other words cancelling the commercial arrangement with a professional tuner is no big deal because you have to pay another to tune anyway. At any point you can ask for tune to be flashed back to Stock else any tuner can overwrite the “locked” file.
My advice is to steer clear of bozos who deal in flashing other people’s original work, sort of like looking for videos on USB at a flea market stall. Cheap trashy is low-brow and dangerous in this context.