One thing I'm fuzzy on is why members of Cage's unofficial outlaw team are considered Avengers when the Avengers Resistance, led by Justice and Tigra, is not. Their mission statements were exactly the same. Both had official Avengers on the roster. And there is a story arc in the Mighty Avengers where Hank's team, Luke's team, and the Avengers Resistance assemble together to fight the Unspoken.
That doesn't mean we have to put Slapstick or Debrii front-and-center, but I think Komodo and Diamondback would be fine Avengers. Ultra Girl possibly too.
Tigra is who decided they should call themselves the Avengers Resistance in Avengers: The Initiative #25.