> I have never heard anyone contest the 'Lisp Curse' claim
You could have asked in the community for opinions.
> This is because Lisp makes it very easy to write your own libraries from scratch;
That's not generally true. Some libraries are maintained for decades, since it would be difficult to reproduce them.
The reasons for writing new libraries, instead of an existing one are more like:
* disagreement with coding styles
* very different underlying platform
* need for a different license
* lack of maintainers for code written decades ago
> people who use Lisp tend to do that instead of reusing third-party dependencies.
I don't think that's the case. There are widely used libraries for a bunch of things and having a stable and standardized language makes it actually easier to write platform independent code and enables code sharing.
There are reasons why people write their own libraries, often because existing libraries were written for different platforms (especially the operating system).
In the free software area of Common Lisp, a system like SBCL is popular because of the network effect in a small niche of Lisp programs. Libraries tend to be better supported in SBCL -> more use for SBCL.