Until fairly recently people had 'forced' social interactions when doing their finances, shopping etc. Even if involuntary they 'trained' people's social skills and withered away at their acquired/innate social anxiety.
Furthermore, even in these situations the persons you interacted with, the cashier at the supermarket, the bank teller, the shop assistant, were often there for a fairly long time, so that all those social-micro-transactions added up over the years. Yes, they were 'strangers', but stangers you to some extend 'knew' or where familiar with. Being around those made you less lonely.
Now you do your banking through an app and a teller machine, you shop online, and if we are to believe the proponents soon your pizza and beer will be delivered by a drone and your online groceries and other purchases by a self driving van. The few contacts in those situations you might still have are not with the same person, but with randos fulfilling a 0 knowledge scripted for efficiency procedure. These interactions can't compound into a latent unspoken social bond and thus contribute nothing to alleviating the feeling of loneliness.