Yeah I don't understand why people are acting so hurt by this. If you want to be paid for something, don't make it open source. If you want to force users to keep the source open, make it GPL/AGPL/whatever. If you want to prevent commercial use, use an appropriate license. This company didn't do any wrong from my limited knowledge of this thread.

Sure it would be great for them to give back, and they absolutely should, but I don't see why they deserve any hate (unless they hide what they did or engage in otherwise shady practices, but based on the comments I'm not seeing that).