many of those who use the internet do not feel confident or able to use it for any financial transaction.
Then learning how to do so is a great deal better than attempting to rail, Canute like, about change that they are not going to be able to stop. They're 70, for God's sake: the arrival of the web as a mainstream thing happened when they were in their late forties. Are people in their late forties currently looking at Alexa devices and thinking "no, what is this witchcraft?"
I would be willing to place bets that in 10 years' time it will be essentially impossible to insure a car other than over the Internet, and the alternatives will be expensive and complex. The same will apply, with variations, to obtaining a taxi outside areas with taxiranks, ordering anything we now think of as "mail order" (that staple of the housebound) and ordering food for delivery. There will be niche services, available over the phone (again, the irony: this debate was being had about the move from post to phone barely a generation ago) which will be expensive, inflexible and hedged around with restrictions.
This is a massive, disruptive social change on a scale akin to electricity. If someone is 70 and objecting to computers, the best answer is "then learn" (and for reference, my parents and in-laws are in their 80s). You can say that's harsh. It is, however, true.
"Echo, pay my bridge toll charge".