I Don't think Anyone, including the FDA, thinks that 100% of "Illegal" tobacco Products can be intercepted by Customs.
But once again, Why would customs be the Only way to prevent these Products from entering the USA?
If I use a Credit Card to purchase an Item, I don't own the Item until the Credit Card balance is Paid. So this puts Credit Card companies in a Delicate position.
Because they would be Involved in the Importation of an "Illegal" Product. And that makes Lawyers Twitchy.
So after US Distributors/Retailers are basically shut down, if the FDA feels there is a Problem with someone like say fasttech, I would imagine that CC/PayPal will receive notice that they might be in Legal Jeopardy if they continue to Facilitate the Importation of "Illegal" tobacco Products.
And just like the FDA sends Under-aged people into Stores to see if a Retailer will sell a Pack of Smokes to a Minor. I'm sure the FDA will see if FT will send a Non-Allowed e-Cigarette to 10903 New Hampshire Avenue, Silver Spring, MD 20993 which was paid for using a CC or PayPal.
But cutting off a merchant account with FT would be incredibly difficult as I’m certain they’re banking overseas, not a US cc processor, and they sell plenty of other Chinese electronics and other products. Who’s going to shut them down?
Even the dedicated vaping vendors aren’t going to get cut off by their Chinese banks just because the US FDA gets in a snit. MC and Visa are global brands and I’m not sure you’ll convince them to cut off a specific product from a specific location that might be shipped to a different location.
Is FT’s merchant bank going to say “no, you can’t accept payments by credit cards to ship to the US but you can ship to every other nation”? It’s not the same as eBay or Ali Express saying small retailers can’t use their platform.
The closest they can come is convincing customs to somehow enforce sanctions against products from that retailer for fulfilling and shipping items into the US. I’m not sure how easy it is to legally do that.