This. GPL is just really really hard to work around if you're selling non-SAAS products. In general, it's not something you try to do if you have any alternative. And nowadays, you almost always have an alternative. Increasingly often it's a more capable, more actively maintained, and better supported option that comes with the added bonus of not needing to take the time to get special approval from your legal department.
I do not know, but I suspect this is exactly why RMS dislikes SAAS: because it can technically obey a license without having to give users the freedoms he designed the GPL to give.
It's deeper than that. By its very nature, SAAS precludes every single one of the freedoms that the GPL is designed to give.
The GPL isn't really about sharing source code; that's just a means to an end. The GPL is about being able to exercise complete control over - and having complete knowledge of - all the software that you use. To an approximation, SAAS is about the opposite of that.
