This is kind of interesting, there isn't anything immediately obvious here as a clear trigger (lots of these complaints when you get into it you can see maybe what triggered).

Are we sure it was the gift cards? Obviously gift cards are often used in various scams etc, but they should have a way to allow folks to prove they purchased them.

My own guess would be maybe gift cards and overseas IP access if there was some of that, the only thing I can think of (that would be a somewhat high flag in the algo's potentially).

A reversed payment in chain somewhere?