In EA's defense – I can't believe I just typed that – it wouldn't have been able to shut down those developers had other people not chosen to sell their companies. You can argue that the developers who sold did so in order to secure funding, but that means EA's financial-driven closure of them is no better or worse than the dev's original financial-driven decision to sell.
I can see your view. I can also see the first few companies thinking it was going to be so awesome to have this juggernaut behind them to really help them shine.
At this point, I have no sympathy for anyone who takes EA's money. You make a deal with the devil, you can't be surprised when he comes to collect.