While the primary goal of RFF is to approximate a kernel, we look at the Fourier transform as a prior distribution over trigonometric hypotheses.
For example, the pyramid scam selling e-books claiming that water used in your car engine saves gas is physically impossible.
Scientists often finds other explanations than those of the pseudoscience.
If they follow the scientific method, and allow scrutiny, then they may develop into a full-blown field The common denominator for the rest is money.
Every pseudoscience has money or an unethical motivation at the root, and dresses crankery up as science to persuade the public.