The top 3 most popular index fund ETFs track S&P500, which doesn't really pull this kind of shenanigan. Only QQQ tracks the NASDAQ 100 and it's in 5th place by assets under management.

You should probably read a book about index investing if you are going to invest.

Yeah, but the S&P500 is hugely concentrated in MAG7, which are all Nasdaq listed. So when they all get sold to buy SpaceX, you can bet your butt something's gonna happen to a S&P500 ETF.