User blog comment:Hitsuji Mamoru/FGO-style Servant Creation Room/@comment-27247829-20170123093001/@comment-27247829-20170123180229

In his case, it comes from actually amassing wealth from his hard work. Poor financial control made him lose a lot, but his productivity made him gain a lot too.

Also, his Golden Rule is E ranked. Robin Hood also have an E-ranked Golden Rule, and I dunno about you, but stealing sounds like hard work also.