No full rollback, since as usual, the number of people exploiting it is relatively low.
What normally happens with these (and I’m gonna make numbers up to illustrate a point, not be completely accurate) is that 75% of players weren’t even logged in during the period it happened. Of the 25%, about another 90% weren’t even aware there was a problem, and may have gotten a double/triple reward accidentally. Of the remaining 2.5% of playerbase, most folks are honest, and either don’t use it or use it one or twice to see if it works… leaving a tiny number of people who exploit it a lot, whom we go and fix.