Sunny: Wha…you planned the cancellation?!
Spike: I’ve always resented Equestria, hate to break it to you kiddo but you’ve been duped!!!

Yep, Spike was the one who orchestrated the destruction of Equestria, Opaline was just a stooge.

Yes, Opaline was a stooge of Spike(Salamandra) used to help him bring an end to Equestria, now he unofficially rules Equestria and decides who becomes a leader and who gets left in the dust.

Spike: Hey! I’m not that nasty! I just want the fandom to restart and start anew with true wholesomeness.