It's a mystery where you have to try and put together different pieces of evidence, match things up, try and look for hidden connections - a certain type of human mind (mine, I guess) just finds that process rewarding.
I've gone down most of these rabbit holes and my 2c is it's one of these two people, not any of the most common candidates: Len Sassaman or Paul Le Roux.
Sassaman is dead and Le Roux is in federal prison in the US, which explains why the coins haven't moved
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.
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
(But losing keys is very easy, especially if the feds take your devices and your means of buying new ones, and freely accessing potential backups.)
Commonwealth English speaker (grew up in Rhodesia/SA) - Sassaman was american and it would be odd for him to adopt British english as Satoshi
Known Windows user and there are supposedly similarities in the tech stack and code between early Bitcoin client versions and TrueCrypt which Le Roux is widely believed to have developed
Early Bitcoin client versions included poker game code for some reason - Le Roux is known to have been interested in this and at one point was considering opening an online casino
On the other hand, evidence against Le Roux and in favour of Sassaman:
The whitepaper has weird references that suggest the author was involved in cryptography academically in the Benelux countries. Le Roux did live in the Netherlands at one point but afaik wasn't involved in anything academic whereas Sassaman very much was
Some people like mysteries.
I was articulating why someone might want to know, as tavavex asked.
The zodiac killer still has an active subreddit! https://old.reddit.com/r/ZodiacKiller/
> Maybe hurting him or trying to profit off of the knowledge somehow, or even just becoming famous for being the person who found Satoshi Nakamoto.
Yeah, there's likely some pride/ego involved, and sadly trying to hurt the person most responsible for cryptocurrency.
Probably the same reason people remain interested in the identity of Jack the Ripper, despite over 130 years having passed.
See also, DB Cooper and who stole the FIFA World Cup.
Nothing wrong with a good mystery.