It would be nice to mention they are not so free software. They are a weak
open source product. Their licence[1] is LGPL[2].
Far better options would be Avidemux[3], Blender[4], Cinelerra[5],
Kdenlive[6], Lives[7], Open Shot Video Editor[8]. All available on Linux,
most on Windows too. And all having the better GPL licence.
In the context, this sounds pretty much as spam. But most people can't see
the difference between open source and free software[9].
[1] https://en.wikipedia.org/wiki/Pitivi
[2] https://en.wikipedia.org/wiki/GNU_Lesser_General_Public_License
[3] https://en.wikipedia.org/wiki/Avidemux
[4] https://en.wikipedia.org/wiki/Blender_(software)
[5] https://en.wikipedia.org/wiki/Cinelerra
[6] https://en.wikipedia.org/wiki/Kdenlive
[7] https://en.wikipedia.org/wiki/LiVES
[8] https://en.wikipedia.org/wiki/OpenShot_Video_Editor
[9] https://www.gnu.org/philosophy/free-software-for-freedom.html
