Basic principle: if you have to ask, it's probably a scam. And there are very few which are genuinely new; they just get decorated differently as communications and technology evolve.
In this case, if you respond I bet the next request will be $50 to see a doctor, then $100 for the special medicines needed, then $1000 because the kid is in the hospital, then $5000 for lifesaving treatment... with heavy guilt tripping attempts if you ever so much as hesitate.
"It's only $10"... and showing that you are a sucker.
If you want to support strangers there are huge numbers of legitimate aid organizations. Pick one or more.
(Afterthought: this may also be someone who just wants to annoy the card's actual owner. Or the card may not exist and the next suggestion will be crypto, or through some mechanism that looks legit but steals your credentials, or... There are many directions this could go; we can't tell what they had planned.)