YouTube have done the same with the Premium subscription. From the email I received:
> We are updating the Terms of Service for YouTube Premium, YouTube Music Premium and YouTube Premium Lite subscriptions ('Terms'). These new Terms will be included in the YouTube Paid Service Terms of Service and will come into effect on September 26, 2025.
> We are making these changes to improve clarity and transparency regarding your subscription, including:
Clarifying our plan types.
Explaining our policies on promotional offers and accepted payment methods.
Clarifying that your subscription access should be predominantly from the country where you signed up.
Providing additional explanations and clarifications on our subscription policies.
I believe that the date may be the end of Q3 for the financial year, if I had to guess, which might explain the similar moves by both parties, though I'll admit that I'm speculating on that point. There's a lot of overlap in vested interests on Spotify and YouTube, when it comes to music especially.
I guess it's time to cancel my youtube premium sub since it's US-based but I no longer live there and it's not available where I live now.