How to create your own license providing website?

Hi, I was just wondering how are the websites like Creative Commons are developed for instance

Do we need to have any permission from any govt. authorities to provide license (Attribution or Non-Commercial) or are we independent to do that?

If So

What are intriguing challenges behind building websites like that?

And, Most Important

Why do these websites need investments/donations for maintaining their websites, like they just need to provide license right? and information about the respective license. Or is there anything else?

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