[derefr]

What the parent is talking about is the more generalized "net-neutrality violation" of assuming that users on residential plans have no legitimate reason to be hosting any public-routable services. It's the ~30-years-back ISP coup of dividing the flat space of Internet "peers" into separate categories of "servers" and "home PCs", where default-deny policies are enforced on "home PCs" to prevent them from doing most of the things "servers" can do.

Theoretically, true "net neutrality" (in quotes because it's not really the same thing that the law that got struck down protected) would require that ISPs not discriminate what types of traffic a customer can use their pipe for, any more than a bank is allowed to discriminate what you use your checking account for.

Under this true-Scotsman net neutrality, ISPs should be required to let people host web servers, or mail servers (if they're not open relays), or whatever-else servers, on their residential Internet. If that causes uplink saturation, then price uplink bandwidth in your plans to match your costs! (Which basically would eliminate the difference between residential and business Internet plans anyway.)