Note: Gensim is licensed under the "Lesser" GPL (aka "LGPL"
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html).
I'm not a lawyer, but my understanding is that under the LGPL's terms, its usage as a library/dependency in non-GPL/non-copyleft projects is specifically allowed. So as far as I can tell, there's no violation concerning Gensim here.
Whether any of the other license-violations alleged of TextAttack in your issue <
https://github.com/QData/TextAttack/issues/718> are still a concern, I'm not sure. But note that another of the libraries you mention there (num2words) is also LGPL, and the `FuzzyTM` package may have only been pulled into TextAttack because Gensim has recently (erroneously) declared `FuzzyTM` as a dependency (even though its code is never called). That error has been corrected as of the latest 4.3.1 release on the Gensim side:
https://github.com/RaRe-Technologies/gensim/pull/3447
- Gordon