The Nothingburger:

I came across the term “nothingburger” through this neat conclusion by Emil Kirkegaard:

"This turns this entire thing into a triple nothingburger: there is no autism epidemic, the nonexistent problem can’t be fixed by not taking paracetamol, and the costs of avoiding paracetamol will also be just about nothing since there are plenty of alternatives."

[Source]

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"something that is or turns out to be insignificant or lacking in substance."

"Nothingburger ... is a term used to describe a situation that receives a lot of attention, but which, upon closer examination, proves to be of little to no real significance."

"A nothingburger is a thing that is less consequential or important than originally suspected. The word can also describe a person or thing of little importance."

"something lame, dead-end, a dud, insignificant; especially something with high expectations that turns out to be average, pathetic, or overhyped."