This is interesting. The emotional cost of loss of attention is far greater than the [?] cost of unsubscribing. This feels, in part, like a function of friction: it is harder to gain subscribers than to lose them. Friction in any transaction is an interesting factor: taken for granted (so not-considered) until it is removed. In some areas this removal of friction is universally acclaimed (who likes traffic at junctions?) in other contexts friction is key to humanity and social interaction (who doesn't prefer the companionship of a meal together over a nutrition pill/Huel?).