Everyone from the venerable BBC to the non-venerable Daily Mail did multiple articles on "Blue Whale" -- a panic entirely created by the media itself. Out of those 130 deaths, not a single one has been conclusively linked to any online fads. The figure comes from an article by a Russian newspaper, which based their data on the apparent fact that many young suicide victims in Russia belonged to the same online groups, and some of those groups included some morbid games, so those games must have led teens to kill themselves. Because it's not like depressed people would naturally hang out in the same places or anything.
As for the supposed "masterminds," every subsequent report about the first one was sourced (read: lazily reworded) from the same two Russian websites. The Russian media has a, shall we say, "complicated" relationship with the truth, so it's not certain that guy ever bragged about making up a suicide game, or that he even existed. The others are unrelated suicide-enabling psychos being branded as "Blue Whale" masterminds for clicks ... though we guess there is a chance they were influenced by the initial "Blue Whale" coverage. Good job, media!