The view count is how many times the item has been loaded in the web browser. For maps, apps and scenes, this means the item details page or the item is opened. Separately. Meaning going to a map item details page and then opening the map, counts as two views.
For hosted layers, the number of requests, rather than views, is shown on the usage tab. This refers to how many times a request is made against the service. Opening a map may create 1 view against the map item and multiple usage requests against the hosted feature layer in the map.