there are actually a few giants out there in the basketball world right now. These two, the Bhullar brothers at new mexico st and Paul Sturgess in the D-league.
These players typically cant play at the speed of the NBA. Especially the modern NBA that is so guard and pick and role dominated. The lack of quality bigs and the change in the game has lead to so few true centers in the league and even fewer with elite size (7'+ 260lbs+). The current NBA is more geared towards the long highly mobile center. Players who would be PFs in the 80s and 90s are now legit starting centers in the nba (ex noah, Bosh, horford, sanders). This is one reason I was so high on Gobert last draft. He posses the length and reach of a giant center but while retaining a decent level of mobility.