For one simple reason. When paying with this card, everything is twice, three times and four times cheaper. For example, is Spotify in USA costs $10, with this card, you can get Spotify for just 1.5$ All services are very cheap with this card - Youtube premium, iCloud, Spotify, Telegram premium and so on.
Prices (I'm not reselling, so I have cheaper price)
Ozan plus plan (5 Virtual cards limit) - $15
Topup - With crypto, I'll help you without extra fees.