I personally farmed just under 600 PoM's, and I missed the first 2 days.
Good Event, but it seems like someone has way too many accounts.
The PoM event lasted for 6 total days.
Given that you missed the first two days, then that means you ran an (LOW) average of 15 accounts through a day. That low average of 15 is taking into account that all of those 15 accounts were attuned to TT, HoTO, and IDK (which I doubt is the case) making the average number of total runs you did through IDK (high estimate) around 30 a day
Being that there is no limit to alts, this isn't a matter of someone who has too many alts, but WAY too much free time