The YT transcripts are linked to on the YT page itself. If they remove that, it is trivial to use a local STT model to transcribe the video. If they make it impossible to download a video, you could just have a microphone record all of the sound, and so on. Once you have the transcription of anything, summarizing is trivial. I have a local script that does this and I use it all of the time. Also produce diagrams for YT summaries. Hours saved, per day.