EXT-JS is the shame of software development and ethics. I doubt anyone will have the guts to use EXT-JS libraries as the licenses keep changing on whims. It's not just cancerous but HIV+ve as well.
So your definition of hard-working, talented developers trying to create quality products, while trying to be able to keep doing this by selling a license for commercial projects not wanting to use the GPL license (note that GPL is as open-source as code can get) is "the shame of software development and ethics". I was about to write a detailed reply, but after rereading your comment a couple of times, I think there is just no point in arguing with someone who obviously doesnt know what he is talking about, and is obviously meaning to offend others by making untrue and hurtful statements.
Besides that, The Ext Core library is released under the permissive MIT license, and I'm confident in saying that that won't change in the future.
History shows that the license change was an attempt to find a business model. (they already had commercial licenses with the lgpl - maybe no one was buying?) If you interpret this as being untrustworthy, then so be it. These guys are doing amazing work and to question their ethics, when you obviously don't know them, shows a bit of immaturity on your part.
