[aidenn0]

It doesn't look like it obligates me to do anything. It contains a request to cite, not a requirement:

  If you use programs that use GNU Parallel to process data for an article in a
  scientific publication, please cite:
  
    Tange, O. (2023, July 22). GNU Parallel 20230722 ('Приго́жин').
    Zenodo. https://doi.org/10.5281/zenodo.8175685
  
  This helps funding further development; AND IT WON'T COST YOU A CENT.
  If you pay 10000 EUR you should feel free to use GNU Parallel without citing.
  
  More about funding GNU Parallel and the citation notice:
  https://www.gnu.org/software/parallel/parallel_design.html#citation-notice
  
  To silence this citation notice: run 'parallel --citation' once.

[edit]

This is really similar to the kerfuffle where the maintainer of Home Assistant asked distros to not repackage HA; it's a request, a bit at odds with community norms for libre software, but one that people are legally free to ignore.