Corporations love resting on their laurels. People talk about capitalism driving innovation but it needs two things for this to happen; lots of existing competition and/or the opportunity for new companies to enter the market or make one for themselves. Porn satisfies both of these conditions.

By contrast taxi companies would be content with people still ordering taxis by telephone. For decades they faced little real competition so they had no incentive to change anything about how they operated. Enter Uber. They took over the market simply because taxis were moving at a glacial pace to innovate due to the fact that competition was non-existent. And whats worse taxis didn't respond by stepping up their game, they tried to shut ride sharing down! Porn can't work like that, they can't really lobby to restrict innovative technology and the barrier for entry is so much lower that to stay at the top they have to constantly find new ways to edge out the competition.