So i guess Satoshi's anonymity is partly due to the fact that he was active way before he became known -- and potentially searched --
I also have same assumptions because immediately he saw that he was becoming a center of attraction he just stopped being active and said he is moving on to other things because if he had continued there is no way he would have stayed till now without his identity being revealed.
Also no one wants to engage so much ressources and money just to find him, but with an unlimited amount of money he could probably be found.
Do you really thinks no one is interested to find out who Satoshi Nakamoto was? And you think probably because they don't have enough resources? I don't think so because it could be that the data they would have used in tracing his identity is no longer available.