I stick to DVDs mostly because I don't want some Amazon or iTunes suddenly decide I shouldn't have access to movies or books or audio because of some weird glitch.
Apple can disable your iTunes account if you use an iTunes gift card that was purchased via fraud.
Note that Kindle books can suddenly be taken away as well.
I go by the rule: you only own it if you have the physical media in your possession.
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No they can disable your access to them anytime do a search on "Disney and amazon Christmas shows" for example to see the scummy disabling routine this past Christmas that Disney did.
Quote from that article:
"But Amazon signed an agreement with Disney saying that Disney had the right to withdraw its catalog any time it wanted, for any reason — and the customer just has to deal with it. "
So anyone "purchasing" Disney video via Amazon has to realize that it can be removed anytime. The content providers are hurting themselves by insisting on a "rental" model.
Heck, even libraries have trouble with eBooks - publishers try to limit the eBooks to being loaned out no more than 20 times before the books expire.