But that open-core subscription model is the way open source makes money! Not enough people pay for software out of the goodness of their hearts to make a living off of it.
Nice files you got there. It would be a shame if they suddenly become unreadable, eh?
Even the so called "open" core is a joke. Just try to add anything useful. It will get rejected in favor of a paid option.
The whole thing is just an offensive anathema to open source.