It runs on the Esri Home License - ArcGIS Pro and an Online site with 100 credits - for $100 per year. I use it to improve my ArcGIS skills while publishing historic maps to support my Choptank River Heritage volunteer blog about Caroline County, Maryland, history
I was surprised to find that 7 percent of my annual credits were used up in the past 14 days, mostly for storage:
Storage of what? You have to drill down deep to find that. The help doc is here. The gist is:
Click View Status > Credits > Storage > [Storage Usage Chart] Feature Storage > [Feature Storage Usage Report] Database Storage. Then download the CSV.
Now I see it. I can certainly get rid of this stuff:
And pay out another $100 to keep my historic maps and GIS skills development going.