Definitely not. Spider-Man is a prominent figure in the Marvel universe and has no place in DC Comics. DC and Marvel are separate comic book entities with their own distinct characters and storylines.
The Elongated Man is definitely a meta in DC Comics. His powers set him apart from regular people and make him a valuable member of the superhero community. He uses his stretching ability to solve crimes and protect the innocent.
Definitely not. Spider-Man is a Marvel icon and has no connection to DC Comics. The character's storylines and adventures are confined to the Marvel universe.