If we buy the actual story, when Hanafuda was kicked out of the Warlords for losing to Ace, it was rival pirates that eventually killed him, not the WG.
With Moriah, the WG went to kill him right away, almost like they didn't want him teaming up with anyone else. That might be because of the poneglyphs. Also, CG doesn't have an official poneglyph reader, so that might be Moriah.