The reason to continue the project and not focus together on the more maintained fork [1] is to keep support for python 2.6 and 3.2?

In 2022?

For a thing that is made to talk to the internet?

Python 2.6.7 was released in 2011. Python 2.x overdue EOL was in 2020. Python 3.2.6 was released in 2014.

That's has to be one of the worst reasons for duplicating efforts ever.

[1] https://github.com/yt-dlp/yt-dlp

Yeah that’s completely nuts to me, I’ll continue to recommend yt-dlp for the significant future.

Is there any GUIs for yt-dlp?

I tried https://github.com/axcore/tartube some time ago and it worked. I mostly use the command line though, it’s really simple.