Yeah, I mean we do get some American food over here, but it's sold as specialty stuff and ridiculously expensive. I'm basically addicted to US Dr Pepper (they use a different recipe in Europe, hell in the US and Canada Dr Pepper is produced by Pepsi but in the EU it's made by Coca Cola) but the price is already crazy. A 12 pack is about $6 USD (pre tax) on offer in Walmart, in the UK on Amazon it's £28 (inc tax) for 2 ($38.05 or $14 per 12 pack). On the shelves in places that have it the cheapest price is probably £1.50 per can ($2.04) but only goes up from there.
There are a fair few US candy shops around Europe, at least in major European cities, but more than likely these are money laundering fronts first and foremost.
Maybe, but I think a transitional approach would be needed to minimise the damage locally. In other words, get the services up and running first, so that the alternative is at least somewhat viable before you force people to pay for not using it.