In order to make this even remotely plausible, the rules for tax deductible charities would need to be far more stringent. And then you get a situation like we currently have in Austria, where not a single EA-aligned charity is tax-deductible at all.
Maybe you could do 70% with some intermediate level of stringentness. And plenty of EA charities are tax-deductible in the US, which is where much more of the wealth is.
In order to make this even remotely plausible, the rules for tax deductible charities would need to be far more stringent. And then you get a situation like we currently have in Austria, where not a single EA-aligned charity is tax-deductible at all.
Maybe you could do 70% with some intermediate level of stringentness. And plenty of EA charities are tax-deductible in the US, which is where much more of the wealth is.