I have quite a number of iLok plugs so I have 2 dongles for the licenses I can use as backup or on 2 machines at once. A very few on mine use the computer based non dongle option. This is now fairly widely available so a lot of users opt for it. But I have had problems with the on computer option on WIN 10 updates losing my keys (meaning I have to sort it out on each rig). Also I couldn’t afford all the license copies and have 4 machines I use so I chose the dongle keys instead. They are immune to the updates problems as well.