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Indigogo and GoFundMe already do.

They are: https://www.theguardian.com/technology/2019/mar/07/facebook-...

Guess what, they've already started!

https://newsroom.fb.com/news/2019/03/combatting-vaccine-misi...

Yes. Why are the measles still a thing?

The MMR vaccine does not give full immunity(the reason booster shots exist), immigrants can enter the country while carrying the disease, and sometimes live virus vaccines like MMR can leave the people who get them contagious. The only ways to have zero cases of any disease in the country are to either eradicate it globally (like small pox), or to eradicate it nationally and prevent cross border transmission (like polio).