When Bergevin offer sheeted Aho it was actually to try and improve the team on the ice. This here is a move out of pure pettiness and spite.
It is but it's also about sending a message, screw with my team, I will screw with yours back. He's protecting his future assets and making sure he can continue to use RFA leverage to its fullest extent without interference from the outside parties as well as making sure he doesn't have to pay more than what he's absolutely comfortable with for his RFAs.
From a business standpoint, he played his hand extremely well. Put the screws to us tight financially and made sure the message was absolutely clear ($20 signing bonus and copy/paste press release in EN and FR).
It was a masterclass move by all accounts and it really made Bergevin look like a bigger idiot now for that ridiculous Aho OS.