Except that in-state businesses use services of the state they exist in. Out of state businesses do not, yet they will be required to perform an additional service of collecting taxes for other states because those states have deemed it "too difficult" to do themselves by enforcing a use tax.

So if I got this right SD says the task of collecting taxes from those who reside in their state is not possible for them to do, and unless they honestly think it would cost the vendor $0 to perform this task, they are imposing additional cost of doing business when they provide no services to the out-of-state vendor.