The plug-ins are NOT part of KODI’s core functionality.
Although it could be argued the native stuff are plugins too, they are built on the same framework but source your media from locally attached storage (USB, SD card, HDD) or network server/stream (RTSP, SMB, FTP).
YouTube and twitch plugins work well for me.
And if more than 0%, where in the world are they getting the DRM free digital files?
Or just set it up on your computer.
I gave it a try, and found it clunky and annoying to use, so I've since built a solution that meets my specific needs.
Eventually nobody knew why it was called XBox Media Center when nobody really used it for the XBox. So they changed the name to KODI because it vaguely resembles REWIND STOP PLAY icons:
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K O D I
So that’s a little history, but I still mourn the loss of legacy screensavers like the excellent ‘matrix’ and the native ProjectM/Milkdrop support which hasn’t isn’t present in the Pi version or newer PC builds for years AFAIK.
Anyway, this is like banning Chrome because you can go to a porno website.
I now use an AppleTV 4K to stream UHD movies from a NAS. But the concept is the same.
I had thought it must be named after someone's baby brother.