The streaming market leader is apparently adding an optional Al package to its Spotify Premium subscription, reportedly costing $4 to $5 per month, which could make the service's Premium subscription up to 39 percent more expensive.
This sentence is nonsensical - if you get an optional addon, then it's per definition not a price increase.
It's like if I went to the grocery store, bought the same items as before and then added several more to the cart, and claimed that "my grocery bill has increased". Apples and oranges.