This is indeed an armed rebellion.
Sevens and Harlin Aike, both of them used crude tools to cut out the prosthetics they needed and forcibly installed them—
Elliot has always been the target of Lille's interference, perhaps his rise and courage are heavily influenced by external control, making it difficult to determine if it's spontaneous.
But the existence of two unexpected factors beyond Lille's awareness means that the greed, brutality, and privilege of the high-ranking members of the European Union have sown seeds of hatred throughout the Union.
What they need is an opportunity.
It's as if the Central Committee, which holds power, can abuse their authority to indulge themselves with innocent children for their desires, and can escape culpability through a complex power structure—all these Avengers also need an opportunity:
This opportunity is the truth, created by Sevens for them.