Meh, Paul was a bit whiny. "Woe is me in these chains for Christ!" No one wants to hear that all the time. Others were being fed to lions and whatnot. "Me, me, me, me." Besides, he genuinely belonged in chains; after all, he was a murderer.
Gotta remember he was a spoiled rich kid. Who he studied with wasn't cheap & is still revered in the Jewish community today. Also, he was a single Jewish male with Roman citizenship.