IT support was never the plan
The underlying core product is a business workflow/process engine; early investors said 'that will be hard to sell, create an exemplar implementation of it' and that was the IT Service Management product that ServiceNow grew with.
So it's not a surprise that they're branching out into other business domains now, and it's also entirely understandable that their first market segment continues to be the primary revenue generator - it's where they're already established, and in many regards one of the market leaders.
It is however very valid to point out flaws in their licensing approach, although whether ServiceNow view them as flaws..