Do you want to download YT videos right now on any device? (Not "I might download it later".) Or: do you refuse to use YouTube.com and get spied on? Do you like using a privacy-focused YT frontend for YouTube but don't like how Invidious/Piped emits shit-quality videos? I have made a LAN-complete solution for this:
[simple code here]
( https://paste.ononoki.org/?a3368a7c225ce130#8ivP4DUtLbwgLbw7Kfk6uRkuiQ4G4BLmSbyth4SEFH3p - chat-gpt.org/chat was helpful because it told me about a variable that CGI provides to shell scripts. )

Start a download via your local IP address which is running Apache Server with CGI on:
http://10.0.0.123/cgi-bin/yt.sh?id=wtxanSrNdN8

Watch that video which was downloaded to a storage device which is capable of storing terabytes:
http://10.0.0.123/c/put/cunt/wtxanSrNdN8.mp4

Here's video quality comparisons of Invidious vs. yt-dlp =<720p downloads. Videos:
. Jewgle moment https://invidious.perennialte.ch/watch?v=FjFioFNYmNA
. a video uploaded by some tard https://invidious.perennialte.ch/watch?v=xiX5_bGQVoI
Also, seems to download videos with a better bitrate or FPS than what is seen in Invidious.

Possible future updates:
. Download at best quality