  Using the $\infty$-categorical enhancement of mixed Hodge modules constructed
by the author in a previous paper, we explain how mixed Hodge modules
canonically extend to algebraic stacks, together with all the $6$ operations
and weights. We also prove that Drew's approach to motivic Hodge modules gives
an $\infty$-category that embeds fully faithfully in mixed Hodge modules, and
we identify the image as mixed Hodge modules of geometric origin.
