> It'd be very difficult for Montana to enforce the other piece of the TikTok ban
I don't know if it is technically and legally feasible in Montana, but you "just" need to block the endpoints that the app uses to fetch the data. It is not foolproof, but given that ByteDance probably has interest in keeping doing business in the rest of the USA, at least for now, it would be fineable in case it was trying to avoid the block.