As another user commented, the total cost per year is around ~$34 million which is roughly 5% of the total $600 million they're looking to raise. That 600 milli

As another user commented, the total cost per year is around ~$34 million which is roughly 5% of the total $600 million they're looking to raise. That 600 million will be invested to target some annual return and as long as that return is expected to be a couple of percentage points over 5% (which is not an unreasonable expectation) then they should be able to more than cover the cost every year, without even touching the principal amount. Looks like they're raising the total amount via donations