You could still go and create your own License but its standard practice to just pick one that suits best for you (if you’re not trying to do something weird)

Now you don’t have to go through each different license to know what is/isnt allowed.

Why haven’t we come to something similar for privacy policies. Is there some obvious reason I’m missing?

PS: If there isn’t a good reason for it, I’m interested in creating a schelling point of sorts for this, please let me know if this sounds interesting