Comment by vel0city

I think it should vary based on the type of service being provided. Truly mobile service, I think it can make sense to not allow servers. If its being sold as a home internet solution (a more fixed kind of plan), I think it should allow servers to at least some level of hosting services.

The main difference is there's usually limited airtime capacity for clients, especially highly mobile ones. A server could easily hog quite a bit of the airtime on the network serving traffic to people not even in the area, squeezing out the usefulness of the network for all the other highly mobile people in the area. This person moves around, pretty much doing the equivalent of swinging a wrecking ball to the network performance everywhere they go.

When its being sold as a fixed endpoint though, capacity plans can be more targeted to properly support this kind of client. They're staying put, so its easier to target that particular spot for more capacity.