∀ {Ω : Type u_1} {Ω' : Type u_2} {mΩ : MeasurableSpace Ω} {mΩ' : MeasurableSpace Ω'} {ν : MeasureTheory.Measure Ω'}
  {κ : ProbabilityTheory.Kernel Ω' Ω} {X : Ω → ℝ},
  ProbabilityTheory.Kernel.HasSubgaussianMGF X 0 κ ν → X =ᵐ[ν.bind ⇑κ] 0