Package naming clashes

[Luther Goh Lu Feng]

I am sure that there is precedence and guidelines in place, but I couldn't to find the search result. 

Say someone in the community builds a snap for nginx, and later doesnt keep the snap up to date. Then another person builds a more updated nginx snap. How are the package names chosen so that there would be collisions, and people know that they are installing the latest working version?

Is there some sort of handing and taking over for the package name from maintainer to maintainer? How is it done with Ubuntu deb packages at the moment? Thanks


-- Luther