Read The Title
#1 lichess is open-source, meaning that everyone is allowed to use it.
"Lichess is free/libre open source software. You can download, read, use and modify every bit of source code."
So they don't need Thibault's permission. Now, rather that is a good or bad thing is up-for-debate.
#2 "I don't think it's fair from taking all Lichess hard work, and then putting it into Lidraghts"
well, if you don't think it's fair then blame it on lichess, because by being open-source, lichess automatically agrees to people being able to download, read, use and modify the code as they please. So if anyone does that, it's lichess fault.
Saying that that isn't fair is like calling hitting someone with a ball in dodge-ball not fair.
#3 "At least do something your self"
Why fix what isn't broken? Lichess is not perfect, but pretty great I would say. If lidraughts could improve upon it, then sure. But should they do something themselves just to not be lazy? I don't think that's a good reason.
@LifeWithOutAMeaning, Its a Source code check github.com/roepstoep/lidraughts
"A more personal motivation behind lidraughts.org is to remember our friend and teacher Tjalling Goedemoed, who passed away much too young in 2016. Few have contributed as much to the game of draughts as he did, as an inspiring teacher, problems composer, writer of articles and books, and of course a very strong player. May this website be seen as a tribute to his work!
Many words of gratitude must be expressed towards Thibault Duplessis for his brilliant piece of work lichess.org. As the astute reader may have noticed, lidraughts.org bears a lot of resemblance to this website, both in name and appearance. Although the two are not formally affiliated, it is safe to say that lidraughts would not be here today without the source code of lichess as a basis. In its first incarnation, lidraughts.org uses the same framework as lichess.org, reimplemented for the game of draughts. So a big word of thanks to Thibault, the other lichess developers, and the open source community in general!
The full sourcecode for lidraughts.org is available on GitHub."
So thats not a big deal you know? Any website can get influenced from others. And try to find out the reasons of your Protest before Protesting. Ok?
Why you protesting