Everyone gets MagicBands. I will bet that they take pictures of everyone when you check in, too, just like on a RL cruise ship.
They will know what you look like, and they will know if/when you have an Oga’s/Savi’s/Droid Depot reservation. They will know when (and where) you are in-line for MFSR and RotR. They’ll know when you’re eating at CB7 or shopping in Dok’s.
They won’t be able to get to everyone, but on the whole, they *will* be able to find you if they want.
Or even simpler - they could just watch for guests wearing the GSC MB. They could approach you, scan your band to get your identity and “ask you a few questions.”