What you might not have known is that Toomes and his crew — as we will see in the opening scene of Spider-Man: Homecoming — were cleaning up Chitauri alien tech after the Battle of Manhattan from the tail end of The Avengers, and they will end up using some of this stolen tech to create their villainous suits and weapons.
We have reported, earlier on the site, that Adrian Toomes (Michael Keaton), aka The Vulture, has a bone to pick with Tony Stark after the billionaire playboy philanthropist creates Damage Control and cuts Toomes out of the salvaging and clean-up business, thereby costing the businessman a lucrative gig.