I just use ye old faithful of piratebay, through the tor browser so my ISP doesn't do shenanigans to it, then ffmpeg to get only the streams I care about (video, english audio / japanese audio + english subtitles) and reencode it to h264 mp4 so the files aren't gigantic and are compatible with everything. A bit old-school maybe but it generally works fine for me.
I live in the UK so I'll also sometimes pull stuff from iPlayer, which yt-dlp works perfectly for, and also off youtube