> What's the rationale?
Most likely stolen cards. Stolen credit cards are used to purchase gift cards which are then resold to unsuspecting buyers. Think of it as stolen money laundering.
> It would make more sense if they just locked the person out of redeeming gift cards or something, not the entire account.
I always wondered why sites like g2a sell gift cards at a price higher than the gift card is actually worth.
A lot of things are clicking into place for me in this thread.