In the US what it will be is good evidence to support a claim by GitHub that they were an "innocent infringer"--someone who did not know they were infringing and had no reason to believe that they were.
What that does is in the case where the plaintiff seeks statutory damages (which they almost certainly will¹) is lower the lower limit. Statutory damages are normally $750-30000 (amount determined by the court). If a defendant proves they are an innocent infringer that lower limit drops to $200. If the plaintiff can prove that the infringement was "willful" the upper limit goes up to $150000.
Statutory damages are per work infringed, not per infringement, so we aren't talking $200 or so multiplied by the number of copies GitHub distributed. We are talking of a likely award of $200 or so total (plus maybe attorney fees).
¹It is usually way too hard to determine actual monetary damages in cases like this, and actual damages are likely to be quite low anyway, so plaintiffs almost certainly will go for statutory damages.