Long term rationale for WF direct indexing

I’m tempted to get the Wealthfront S&P 500 direct indexing account for the S&P 500. From what I’ve understood Wealthfront will do the auto rebalancing as stock prices change or when new companies get added to it.

What happens if you want to move your accounts out of Wealthfront ?? Or when Wealthfront goes bankrupt ?

Will you be left trying to mange 500 individual stock investments. Given this info is it still worth it if you are considering a 30+ year time horizon? Given that the biggest benefit is tax loss harvesting.

Fidelity gives me an S&P 500 option for 0.15% expense ratio