First they take the pressure off governments

Governments will never be able to hand over money to other governments with proper the strings attached. The receiving nation would find that too meddling/threatening.

Second they palliate and and thereby delay merited revolution

Difficult to imagine children in any country making a revolution. If you are under 15, and you are a carer, or abused, or orphaned or ill, what voice do you have save through those who will take up the banner on your behalf.

Until the millionare celebs put their hands in their pockets I won't

Which millionaire celeb did you mean? How do you know how much they gave or didn't give? How do you know that what they gave (if they did) was or wasn't proportionate to their earnings/worth as anyone else's?

You don't know. You can't know. If you don't want give to a cause, that's fine, that is your choice. I have no problem with that. But please don't base your reason for not giving on an unknown.