The trap, stated plainly
Most streaming services bill a card on file. A gift card adds a balance to an account. Those are two different payment paths, and on several major services they do not meet.
Typical patterns:
- Balance accepted, applied automatically at the next renewal. The best case.
- Balance accepted only for new subscriptions, not for one already running on a card.
- Balance not accepted at all — the gift card only buys individual rentals and purchases.
- Billed through an app store, in which case the app store's gift card works and the service's own does not.
That last one catches a lot of people. If someone subscribed through their phone, the subscription is billed by the app store, and the service's own gift card cannot touch it.
How to check in one minute
Ask the recipient, or have them check, which of these they see in their account:
- A Redeem a gift card option in the billing section — good sign.
- Billing shown as "via" an app store — buy the app store's card instead.
- Nothing about gift cards at all — assume it will not work.
What streaming cards are genuinely good for
- Starting a new subscription for someone who does not have one.
- Rentals and purchases on services that sell individual titles.
- Prepaying a renewal where the service supports it, which some people prefer to a recurring charge.
Sport is its own thing
Live sport packages are frequently sold separately from the main service, often at higher prices and on shorter terms. A general card for the parent service may not cover the sport add-on at all. If sport is the point, confirm the exact product.
Choosing an amount
Match it to whole months of the plan they actually use. A card worth two and a half months is strictly worse than one worth two, because the remainder sits there.
If you do not know the plan, a round amount and a note saying "towards the subscription" avoids implying a precision you do not have.
Full detail on the subscription question is in gift cards for subscriptions and renewals.