What do I propose? Good for creating a multiverse without an established canon, with an already established meta cosmology yet each universe and its own different author. 
For an example. 
Author 1 collaborates with author 2, author 3 does not share the universe of car 3, but as I said there is no established canon, there is no contradiction that author 3 has his own canon established the multiverse of args. 
Since each branch has its own arg
*Why the creation of the multiverse? Unlike the roblox arg wiki (I doubt if that still exists) this arg multiverse does not ask you for any requirements to meet, I mean, it doesn't matter if your arg is new or doesn't even know how to do something, what they contribute to this project could teach or advise an arg itself. I mean it doesn't matter if you only did your arg in avatar studio and you don't know how to program (I don't remember the name of this) as I already said there is absolutely no limitation, you can write it and do it in pdf. It's like Fear Mythos (a multiverse of Slenderverse universes but without an established canon) but instead of Slenderman it will be from Roblox. And what rule does this ambitious project I propose have?
1. The arg can be players experienced strange in their strange/disturbing games/situations or etc. as would be a generic arg (category 2)
2. Each arg is a branch of an immense tree (nicknamed pale tree), by containing finite amounts of probability and different laws, your arg can exist and coexist regardless of whether it has broken the canon of a universe. 
3. Out of respect for the author, you should ask him if you are going to do a crossover with another universe, you would have to respect what that author says, this is a matter of respect without distorting a work itself. 
And that's all. 
And what are the categories? Well. I only propose 1 and 2, however you can expand it however you want. 
I already mentioned category 2 before and category 1 is a separate universe, and what do I mean a separate universe? Which belongs to the PA universe (the universe of my own cosmology and with its own established rules... I call it as K Mytho) I want to contextualize each "universes" can be a meta category. Your arg can be a category or it can be a Multiverse meta category far from the established rules of the PA. And what makes this project special? As I already said, the advantages mentioned before. The project will try to be a "fear Mythos" type of shared universe without an established canon and also to promote small args or discuss or ask for advice. As I already said, it doesn't matter if your args are written (written in PDF or published in a novel repository) or already made as a series and published on YouTube. This project will try to help all the people who need help or want to belong to another's arg without being ashamed to ask permission. Are you interested? Answered in question could be common
"And what happens if the author no longer wants to belong to the project?"
- nothing happens, the project could kindly come out without any problem or discussion, all with respect to the author. 
"And where will the arg be stored?"
On Discord and its own wiki (and no, not using fandom) as well as on YouTube. 
If you are really interested, you can talk to me and add my Discord user (koiamaafuny). Ambitious project. Probably yes.
If you have more questions about this, ask me! And I gladly answer them.

The most ambitious project currently at r/robloxargs