Hi, im c00ld0c26, one of the old modders in the community.
Well, there are a few reason, you got ppl like Govertmentman who just like to say "HEY LOOK AT ME I CAN MOD BULLY!, AND YOU CANT IM SO AWESOME".
All he did was show off his mods at videos, and then rant on anyone who tried to mod himself, which was a bit samilier to his mods.
There are other reasons, like ppl which their mods aren't done and such.
And propably the latest reason, is the PSSM mod, (Player Selector Mega Mod) which has been cancled.
Now why such a mod make 90% of the modders not release any source of code that is related to it?
Well out of respect of the authors which requested not to, until the mod is done, as they are very big and respected members in the community.
Tho since it is cancled now, I dont see any reason not to share at least parts of the codes, like the action nodes maybe.
But one of the modders who was working on that mod claims that "The community doesn't deserve the mod", therefore he refuses to release the main code in that mod, which I still find no reason not to, but I respect that.