Ah sorry I believe that in Germany they call it incitement to hate or something like that, which is criminal.

edit: from a very quick search I found this http://www.aljazeera.com/amp/news/2024/8/6/german-court-fines-woman-for-from-the-river-to-the-sea-chant which meand that by this judicature it is directly criminal. Also this source https://www.i24news.tv/en/news/international/europe/1699528989-berlin-criminalizes-slogan-from-the-river-to-the-sea-palestine-will-be-free. But here I dont know how reliable this source is