Don’t forget IOT Cloud back when IOT was a thing. I think I was one of the first 10 people holding that certification. I really liked the architecture but the product sort of went nowhere. After learning about data cloud I feel like a lot of that architecture (iirc it was called Thunder) wound up in data cloud.
I think silicon labs uses salesforce for their iot cloud. The iot cloud - globally - is gigantic, and a requirement for any embedded iot device with a radio.