Right now it is not possible to do so as the installers are all bundled with the content. What you can do is customize your install to specify a new location for the default content and then remove that directory from your Content Directory Manager listings.
The basic content also has it’s own uninstaller (a link is in the “DazStudio4\Installed DS Content” directory) which you could run to remove it. I agree with the OP there is nothing in it I use either. In the good-ol-days of Studio 3, Daz would release 2 installers, one with Content and another without. The one WITHOUT Default content, still contained the stuff like lights, shaders etc, as mentioned by Takeo.Kensei above, but removed the rest of the “fluff”. Hopefully DAZ will return to this and make it a seperate installer, or better yet a seperate download(so we don’t waste time downloading 400+ megs that were never going to use.), for the final version.