This is my reasoning, I'm not the creator of this.
Sometimes, large companies open-source a SaaS product because they expect to make more money from the free marketing (See yesterdays post about headline-driven development) even though their implementation remains closed.
We still give them news-space, don't we? Why should we act any differently for solo developers?
Other organizations still, have open source only policies, or no open source at all.
Many of these applications can be in government.
It can increase the footprint.
I know of some CMS’ which were dual licensable for this reason.
Other reasons why:
https://www.channelfutures.com/connectivity/reasons-organiza...
As someone seeking a purely open source forms solution, what do you mean by this?