Funadmentally it makes sense that tax take is 0 at 0% and low (though not neccessarily 0) at 100%, but in practice it only ever used to advocate for lowering taxes no matter what they are set at currently. You never see people talking about governments being on the left side of the Laffer curve and therfore we should raise taxes.
There’s also no evidence that I’m aware of that the curve is smooth, single peaked or even single valued and it is also likely highly dependent on myriad other factors, in short it’s effectively useless except as a rhetorical device for small-staters to advocate slashing taxes and public services.