Woaw, that’s a surprisingly sad thing 😳

That’s mentioned only in the end of the article:

By contrast, since the fall of communism, Solidarity, which remains Poland’s largest trade union, has become increasingly aligned with right-wing political groups, in particular the Law and Justice (PiS) party that is currently Poland’s main opposition.

So: a party that is all about “survival of the fittest” now has full say over the logo, and is using that to suppress any of its traditional uses.