Daisy, an AI granny wasting scammers' time

I'm imagining this is just a publicity stunt, and I'll say it's a very good one. However I can't see it being very practical. There are lots of scam calls to keep up with and LLMs and text-to-speech models are expensive to run. If they do run this in production, the costs of running hundreds of 'Daisies' will inevitably be passed onto the consumer, and worse still, if the scammers are calling in through PSTN lines or cellular this will use up our already scarce bandwidth. I've frequently had difficulty connecting through trunk lines from Belgium and Germany to numbers in Britain, and that's without a legion of AI grannies sitting on the phone!