Wang didn't get $14b, he only owns about 15% of Scale. We also don't know how much he sold. He could have sold all of his stock (netting him around $4.5b), none, or something in the middle.
I could see a friend giving me 4% of his net worth on those terms, esp. if i might return a few percent, in the fullness of time.
If a friend doesn’t give you 4% of their net worth, how can you be certain you are one of their 25 closest friends?
It also seems like a sort of different situation with Zuck because, I’m pretty sure, he’ll still be able to get by with only 96% of his net worth.