I would say most people, even most people still using paper billing in 2022, have a billing method set up (be it CC charges, direct debits or standing order) that would allow their bill to continue to be paid for their main utilities in the absence of receiving a paper bill. It's these people who the companies would rather cajole onto paperless billing.

Then there is the group who are still going to insist on/need paper bills, but use technology enough to catch the email about changing and use the opt out process.

I wouldn't say it's a dastardly plot to kick my elderly neighbour off their service, but simple disregard that people like her that would fall through the cracks while they're trying to save money with the first group.