Nothing is totally new anywhere. We feed on already existing ideas and modify them for better applications.
Even bitcoin got ideas from early cryptographic works of some people.
And today thousands of coins are available and the likes of litecoin, copied and modified bitcoin codes.
In as much as it is an open source, there is the expectation of developers copying an idea that is working and when a particular ideas has been copied for many times it becomes a trend.
So, it should not bother you much since no patent is stollen.