alt Hacker NewsLe Roux was not in prison before 2020, it makes no sense to me that he was spending his time trafficking drugs when he was sitting on billions.
Of course at this point the only "sane" reasons for someone to not touch the wallet is that they are sitting on so much BTC anyway, they don't want to cause the price to drop, or the keys are lost (but the person is alive), or the person is dead.
If someone has access they can hire security for a few billion dollars and still have some change.
If we count "insane" reasons then of course there are quite a few more. Such as ideological motivations.
Your timeline is a bit off - he got arrested on 26 September 2012 (around the time Satoshi disappeared), and he became a DEA informant after his arrest which is why he didn't finally get sentenced for 8 years.
So at the time of his arrest (after which he was in federal custody and the DEA were monitoring all his use of electronic devices) Bitcoin had only been in existence for three and a half years.
The drug trafficking and Le Roux's various other criminal enterprises all started happened in the mid-late 2000s, before Bitcoin was worth anything