NVDA is like 8% of SPY and 6.7% of VTI. So these mega tech stocks are less dominant in VTI, but it's not a night and day "won't really be affected" kind of difference.

And most index funds including Vanguard track an external index. So when the index changes the rules, Vanguard changes what it buys. Vanguard is also famous for always siding with the management, they take the activist side of any debate approximately 0% of the time, so don't expect them to be fighting this for you.