This is the answer. Same thing happened in the early-to-mid 90s. The corporate web site money didn’t come from the IT budget, it came from marketing. The money for the Leased Line Internet connection too, for all but the most R&D focussed companies in the UK. Corporate email for employees and (shudder) actual Internet access for them, often only came later.
If only there were a better way to deploy that capital. Oh well.