b) is like saying 'how is this any different from a car if you drive it until it runs out of gas, and then push it into the ocean, and then wait until it rusts from being under the water, and then you forget where it is?'
Yes, of course it is possible to deny yourself the ability to view content, use software, or access goods that you have purchased. That is beside the point, which is that webapps are inherently transient - unless you have access to the ability to configure and run your own server to host the application, the ability to use it can be revoked at any time, either through malice, negligence, or the regular operation of business. There are numerous examples of all three categories. This is, in fact, worse than proprietary software. At least with proprietary software (DRM/authentication notwithstanding), you have an executable, and it works on the machine you have right now. VM software like VMWare allows you to preserve a particular software configuration indefinitely if you wish, and access that software as long as you like.
Yes, of course it is possible to deny yourself the ability to view content, use software, or access goods that you have purchased. That is beside the point, which is that webapps are inherently transient - unless you have access to the ability to configure and run your own server to host the application, the ability to use it can be revoked at any time, either through malice, negligence, or the regular operation of business. There are numerous examples of all three categories. This is, in fact, worse than proprietary software. At least with proprietary software (DRM/authentication notwithstanding), you have an executable, and it works on the machine you have right now. VM software like VMWare allows you to preserve a particular software configuration indefinitely if you wish, and access that software as long as you like.