His family was getting attacked by a group of ransom seeking criminals the last years of his life who believed he had a substantial coin stash, so he kept a low

His family was getting attacked by a group of ransom seeking criminals the last years of his life who believed he had a substantial coin stash, so he kept a low profile and may have donated without telling anybody. He did write once he gave to his family as inheritance 'a lot of coins' without saying how much it was. It's unlikely he was Satoshi, the early code was full of security problems.