I think that's a bit overly reductionist. This launch cost about $150m (granted, without competition from SpaceX it probably would've been much pricier). I think the going rate for a Falcon Heavy is around $120m. Not a huge difference, and it's very possible that changing the mission requirements to work with Falcon Heavy would cost more than $30m. In the past SpaceX had limitations like no vertical integration, narrower fairing, limitations with higher orbits, shorter time limits between engine burns, less accuracy in some orbits, etc. I haven't followed the launch industry as much lately so maybe thats not true anymore, but I think those things were still true when this launch was purchased ~5 years ago