Where can I watch Attack on Titan in German or with German subtitles for free?

I watched Attack on Titan on Netflix a while ago, but I don't know where to watch the anime from. I would be happy if you suggest a website that is free and that you can watch the anime in German or with German subtitles.

Season 1-3: Anime on Demand

Season 4: WAKANIM

Both for a fee. There's no other free legal variant.

Legally, you can only watch it for a fee in German or with German subtitles.

Seasons 1 to 3, the spin-off and the films are available on Anime on Demand.
https://www.anime-on-demand.de/...k+on+Titan

Season 4 started on December 6th in simulcast on Wakanim.
https://www.wakanim.tv/...nal-season