Why is Venom not in Avengers?

Why is it that the popular Marvel character Venom, known for his symbiotic relationship with an alien parasite and his formidable powers, hasn't been included in the Avengers team? Is it due to a disagreement with Marvel Studios or a lack of compatibility with the team's goals? Could it be that Venom's anti-hero status clashes with the Avengers' more traditional heroic ideals? Or is there a deeper, untold story behind Venom's absence from the Avengers lineup? Could we potentially see Venom joining the Avengers in the future, or is he destined to remain on the fringes of the Marvel Universe?