Different companies can use the same format without colluding. Are you suggesting that in a competitive environment content companies could not afford to anger

Different companies can use the same format without colluding. Are you suggesting that in a competitive environment content companies could not afford to anger their customer buy using DRM? These companies believe that they would lose more sales by not having DRM than by having it. Look at GoG vs Steam. GoG gets some bonus points for not having DRM, but having DRM doesn't seem to costing Steam too many sales.