IIRC there was an incident a few years (without the third boost promo) where a lot of people got an unexpected extra boost -- and there was speculation or a report that a batch job accidentally got run a second time or something like that. On my phone now, will try to dig up some thread pointer later unless someone beats me to it.

Anyway I wonder if that happened again (we'd probably need a few more data points first).

My recollection is that they subsequently reversed the "bonus".