Corporations realize that blockchain is the next big thing (next to big data analysis and usage through artificial intelligence). While they acted like rabbits caught in the headlights, when Napster disrupted the music industry in the early aughts, they understand now that they need to confront the danger in order to survive. However, applying obsolete business models, like monopolizing data, as you point out very well, will not take them far. On the other hand, successful corporations know how to build brands in which consumers trust. That’s the competitive edge they can put in the balance against public blockchains. I doubt that this is a sustainable business strategy, though.