do Enjin Devs still contribute git-hub activity?
I could be wrong here but I don't think they are much active on the GitHub. But to get an official answer from the team I suggest you contact them on telegram.
if they are not active on github, the development of their project stops ?,
but they still always give news on social media, facebook, twitter is always active, and that is the positive
Regarding that, I myself am still confused whether the development of the project will stop if they are not active on Github, but it is better if we continue to follow the development and hope for the best for the development of the project