Piracy

On Android, it's a bit complicated but you if you are experienced you can use termux and yt-dlp.

You can use yt-dlp from a desktop too.

For youtube on android you can use newpipe. It allows streaming as well as downloading.

Take a look at Seal for Android.

Github: https://github.com/JunkFood02/Seal

Fdroid: https://f-droid.org/packages/com.junkfood.seal/

It's a friendly android GUI for yt-dlp, so everything yt-dlp supports it can download.

@Owell1984 This Telegram bot can do it: @YtbDownBot

Try stremio with torrentio plugin, login it via guest login install torrentio and watch/download whichever film TV show you want.

I don't know of any website but yt-dlp is great for downloading videos.

If the only thing you are missing is youtube download ability, why not use one of the many options to do that from a handset? Newpipe or Spottube are on fdroid. https://invidious.io/ allows you to do it from a browser.

They already suggested yt-dlp, but also have a look at JDownloader. You can paste a webpage url and it will fetch all the elements it can download, video included. You can also create download collections in order to download the same files again (or in another computer with JDownloader installed).

Everyone is saying Youtube-dlp but you could also just use NewPipe

You could run youtube-dl or yt-dlp (command-line) through Termux on Android, and that should work with most non-DRM protected stuff.