YouTube-DL-PyTK (formerly known as YouTube-DL-GTK) is just a graphical launcher for yt-dlp. Its purpose is simple; to facilitate the downloading of non-copyright-protected videos from certain internet websites including YouTube.
Source code is included and can be executed directly if you have Python and the proper dependencies available.
I digitally sign some files in my releases. If you'd like to verify those signatures, you can find my PGP/GPG keys at:
https://marcusadams.me/keys.html
If you'd like to read the source code without downloading anything, you can do so on the project's Gitlab at:
https://gitlab.com/gerowen/youtube-dl-pytk
If you'd like to donate there's several ways to do so:
PayPal: https://paypal.me/gerowen
Bitcoin (BTC): bc1q86c5j7wvf6cw78tf8x3szxy5gnxg4gj8mw4sy2
Monero (XMR): 42ho3m9tJsobZwQDsFTk92ENdWAYk2zL8Qp42m7pKmfWE7jzei7Fwrs87MMXUTCVifjZZiStt3E7c5tmYa9qNxAf3MbY7rD