I think it is one of those apps that has an in-game currency, so would imagine that it gets used like crypto, to obscure where the money came from.Googling bigo i'ts a childs live streaming chat app of some kind, imagine if used could incur charges -
though hard to believe that, if friend(nieces) had installed it, that wouldn't already be known, or that saved card details on phone that were then applied by that