But you'll still spend money on PhpStorm (or whatever) and for a good reason. Besides, community edition very much does have open source alternatives: I cannot think of a reason it couldn't be replaces by, say, Eclipse. So it doesn't really mean anything.
The Community Edition of IntelliJ, at least, from which all the others derive (I believe) is open source.
https://github.com/JetBrains/intellij-community