> You are only purchasing a perpetual right to use that item under the terms and condition
To clarify for others: parent is not talking about subscriptions.
When you "buy" content on these platforms, they are not actually yours to take away for ever like a physical book. The software you consume them on e.g a Kindle or iTunes, is actually capable of remotely deleting "your" content at any time, and they are supposedly within their legal right to do so.
They have essentially hijacked the word "buy", it does not implicitly mean what it used to mean, you cannot really buy a copy of a piece of music or a book or a film from any of these large platforms today without removing the DRM and making a local copy (which is technically illegal).