I understand this is a Napster thread and as a result the most enthusiastically pro-piracy, anti-capitalist contingent of HN is going to show up and wave the black flag but at least try to be honest about the pros and cons for both. Streaming services do have their dark patterns and anti-consumer practices but they still offer something of value to the consumer, and despite what people want to believe, are more convenient than piracy for many people.
I mean that with subscription services one is unable to backup, or even "come back" repeatedly to the content. Let's say watching the same movie from time to time - it's not possible because service providers go out of business, copyright deals change, markets become more/less prioritized, different platforms are supported, the repertoire within the subscription changes over time. Thus watching the same movie requires buying it over and over again.