Why AT&T Was Right About HBO. In a Word, We’re Talking … ‘Silos.’ Posted byQ Manning May 10, 2019 Leave a comment on Why AT&T Was Right About HBO. In a Word, We’re Talking … ‘Silos.’ Silos can stunt the growth of any business, from conglomerates to startups. To neutralize silos before they can solidify, try these three techniques.