I don't think this particular incident is any kind of big deal, though it's funny. It was only a £1.99 a month and there was a 7-day free trial anyway. Amazon say they emailed about it as confirmation. I think the issue it shows is how you can't trust voice control for anything important. It's just a bad interface for buying stuff particularly. If I am buying some dog food, I search dog food, glance over the options,…
But something more complicated where you really would like good voice control--like when driving--not so much. For example, with podcasts, I find I really need to pre-populate a playlist and by and large I find trying to totally control my phone by voice is very hit and miss.
Voice assistants have gotten marginally better over the years. But I really wouldn't miss them much if they all went away tomorrow. The vision was/is that they could match at least a marginally competent personal assistant over the phone. And they're nowhere even near the ballpark.