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Quantifying Gnome contributions by frequency, tenure, and affiliated companies:
https://hpjansson.org/blag/2020/12/16/on-the-graying-of-gnome/
Whilst the methodology can't be perfect, it's a nice way of measuring contribution trends.
Some contributors are working on it. There will probably be an announcement before the end of Q2 2021 😇
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
@wilfredh I clearly underestimated the role of RedHat