Many photographers rent specific gear for a shoot. Many people lease cars rather than buy them. Many people rent the accommodations rather than buy them. With the depreciation of some photo gear...a subscription model might work very well. Right now I have a couple of cameras that I could not give away...depreciated from $2500 to basically $0.
So are these people renting gear perpetually on end, or are there breaks? Are these people no longer able to change/edit the images they made with that rented gear, once they are no longer renting it?
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Yet another analogy that would be personal to me (but may/could be a more equivalent analogy) is making DIY liquids for my vaporizers (aka e-cgigs ). If my recipe calculator were suddenly available by rental only (under an 'Adobe Plan'), I would no longer be able to change ingredients (i.e. flavorings) or percentages of ingredients of MY OWN recipes that I made while renting the software - or see when (map data) they were last made. In what world does any of this make any sense at all.
Also in the DIY analogy, all my recipes would be in the one program. If I decided to stop paying the ransom, I would lose continuity when switching to another non-RansomWare recipe calculator. And because I couldn't create ('import') any new recipes after that, what are the chances that I would have wanted to start using such a program to begin with had I known.
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I suppose the DIY e-liquid recipe calculator could be applied to a cooking recipe calculator if people might not understand the e-liquid calculations that are needed -- I guess think of halving or doubling recipes on top of adding or removing ingredients, as well as updating instructions.