As quoted from the petition's status update:

In all two “The Amazing Spider-Man” movies, there was a mysterious individual named Gustav Fiers/The Gentleman, having made cameos as a figure in the shadows. The character himself was set to play a larger role in both “The Amazing Spider-Man 3” and the proposed “Sinister Six” spin-off, but these plans were canceled in favor of incorporating a different version of Spider-Man in the Marvel Cinematic Universe, played by Tom Holland.

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