Because the scientific interest they requested the local environmental officials to not destroy the web, which is not a threat for people. The spiders are not poisonous for humans, in this case. The spiders are also showing no signs of aggression toward other species sharing their web. Most interesting, a similar event took place in 2007 when a spider species called Tetragnathus guatamalensis created a colossal web in Lake Tawakoni State Park in Willis, Texas. That was described, at the time, as “something out of a low-budget horror movie, but I was looking at something five times as big as what you’d see on a Hollywood set,” by Park Superintendent Donna Garde. It was a revelation to many arachnologists.