It started exactly when the public was getting angry at the media about killing healthcare CEOs and expressing their joy, and ended as soon as everyone stopped talking about that.

Which is just conspiratorial thinking. It also ended as soon as people posted pictures of stars and planes as "evidence" and insisted that the evidence was still valid because "the aliens are just appearing as planes". It also ended the moment r/UFO threads showed up on the front page of reddit and normal people who thought this MIGHT be something got to see the insane mental gymnastics of the people insisting we should pay attention to it.