are this 9.5 million BTC are flagged by US government? is it safe to buy bitcoins from these 9.5million btc (maybe from 9.5million flagged btc)
In general, the story is very old, and most of the responses here are for people who created accounts after the year 2014, so we will not know what was happening at that time, and all we can tell you is what everyone can find from searching in Google or news sites.
This story no longer resonates and I rarely find analytics linking bitcoin to the dark web or drug trafficking, or at least not as much as I did when I joined the forum in 2017.