@Jeffro -
So using a LGPL library is actually piggybacking also?

What I don’t understand is why you are for the idea of themes and plugins to have a proprietary license within an open and free environment.
Why shouldn't I be? It seems to be the most correct interpretation if you disregard ideological arguments. And its the devs choice. If devs want release as GPL it is their right as is the propriety way.

From my perspective, you’ve been fighting for the rights of developers to license their work however they please, regardless of the license the platform they are building on or around has. Why is that or am I missing the boat?
If you lock back in history I argued with Chip and thought JS, CSS etc needed to be GPL also. Have also refused to develop stuff for clients that wouldn't comply with the GPL because I wanted to be on the same level as the WP community.
I have changed my opinion after reading more on the subject of copyright law and what other people involved with open source think and also law departments.
And its license their original work. If they use GPL sourcecode their stuff become GPL.
I came to my conclusion since it seems to be the most logical course. None of the proponents of themes are GPL have actually precented any sources for their case except the SFLC statement.

I don’t care about all the mumbo jumbo and all the legal crap in every other post. If you just license your stuff under the GPL just like the platform your building on top of, then there are no problems.
Do as we say or else. There is no problem seen from a law perspective only from a "spirit" perspective.

Why go against the grain when you can go with the flow where everyone is happy.
Because if you don't we will bully you until you do? I'm perfectly happy with the numerous of plugins that ain't GPL.