Umm, can't just Twitter disallow this in their EULA and delete all users who engage in this behavior? Besides, doesn't Twitter have some kind of intellectual ow

Umm, can't just Twitter disallow this in their EULA and delete all users who engage in this behavior? Besides, doesn't Twitter have some kind of intellectual ownership of tweets posted there, so a competitor can't just scrape the site and display the results as their own?