In the early 1990s before shops had internet access a British company called “CardCast” [1] used non-public commercial Ceefax data channels to multicast stolen

In the early 1990s before shops had internet access a British company called “CardCast” [1] used non-public commercial Ceefax data channels to multicast stolen credit card data to high-fraud locations such as shopping centres and petrol stations. [1] https://www.independent.co.uk/news/business/cardcast-in-talks-over-merger-1309032.html https://www.independent.co.uk/news/business/cardcast-in-talk... I think those private data channels were provided via a BBC enterprise called “BBC DataBroadcast”. Their other users may have been the betting industry - perhaps parent OP might know?