This is probably tin-foillery but here me out, it's not the most unfounded conspiracy theory you've probably read
Consider the relationship between uptime of markets and total mail throughput volume. It's like baby boomers; markets go away, large bloat of mail when they return.
Then consider this scenario. Evo falls, LE notices, immediately starts devising a plan. DDoS the most popular markets that push the most volume, while paying careful attention to the frequency of profiled senders/routes/packages. after a few days, let the markets back on and measure any significance in a potential "bump" in the volume during this time and perhaps flag/inspect a few profiled routes that dipped during this time interval, and start profiling any new found routes that followed the dip.
Perhaps they weren't after any busts at all, but the relative ups and downs of mail volume over the course of the past 2 weeks has extremely important implications as to the size, scope, and threat of the trade and this information would make a very good report/analysis. If the bump was big, the DEA can write about the new threat and would begin honing in on the darknet. If the bump was small, there might be a report "total darknet markets drug volume insignificant in larger picture" and we will continue to operate under half-assed surveillance.
Dnm is such a small % of mail you're so off here haha