If this ever becomes a concern, the class B shareholders can convert their shares 1 to 1 into class A shares. Once all class B shares have been converted, class

If this ever becomes a concern, the class B shareholders can convert their shares 1 to 1 into class A shares. Once all class B shares have been converted, class C shares will also convert 1 to 1 into class A shares. This would then make the company eligible to be included in the S&P 500. I imagine that the class B shares are nontransferable, which means that this will cease to be an issue once the founders have fully cashed out.