I'm currently taking all my classes online, but through a brick-and-mortar college (I live too far from campus to attend in person, at least for now), and my school doesn't offer anything above Calculus 2 online, with the justification that the material is too tough to learn without direct instruction.
I have no idea how valid that justification is, but I imagine at least some other schools use a similar reasoning.
I have no idea how valid that justification is, but I imagine at least some other schools use a similar reasoning.