Why would you want a gift card that is not money?
PlayStation gift card, Nintendo gift card, Spotify gift card, etc. The sky is the limit. You gift it, and people use it! Wow. You don't keep it forever like a gold bar or a bitcoin.
Yes, it's a scam, and it's better to give bills and coins, but it's like buying a cake.
If you can’t spend it, what’s the point?
You cannot spend a cake, it still has a point though (even if it expires, like a gift card).
Edit: "phone credit" Is it a for a real company, or for a burner kind of phone?