In terms of what many vendors call unlimited service, Web Hosting Pad's terms of service indicate that their definition of unlimited is what they call "incremental." Basically, as you need more capability, they want to discuss that with you, both to help you get the most out of their services, and to make sure you're using their systems without abusing them.
Telling someone what I do for a living is always an interesting experience. Either we’re totally in sync, both lost in conversation about WordPress woes or some time-saving program update, or it’s me talking with crickets in response. There’s just something about web hosting. It’s hit-or-miss whether someone is up to speed on the nuances of all that this industry has to offer.