Generally, it comes down to a choice between losing/spending money on churners or losing/spending it on advertising. I'd wager some are and others aren't doing their long term math right, but regardless that dynamic emerges, and it recurs.
Typically it emerges where "customer acquisition" is hugely expensive or important and this typically emerges when either (1) it is a winner-take-most-game or (2) the product is an ironic "commodity:" A product that is 90% standardized under the hood but has a sales oriented differentiation layer. EG, the underlying product is electricity, cable TV or money market stuff like insurance or loans. The company you deal with as a customer is a customer services, sales & marketing layer. Guess how they compete.
Typically it emerges where "customer acquisition" is hugely expensive or important and this typically emerges when either (1) it is a winner-take-most-game or (2) the product is an ironic "commodity:" A product that is 90% standardized under the hood but has a sales oriented differentiation layer. EG, the underlying product is electricity, cable TV or money market stuff like insurance or loans. The company you deal with as a customer is a customer services, sales & marketing layer. Guess how they compete.