A lot of them are heavily invested in index funds that added SpaceX at IPO due to market cap.
I now use the Interactive Brokers MCP to make a "pseudo QQQ" which has all companies except Tesla and SpaceX in there, and I otherwise use the same weights as the official QQQ. In order to avoid tax overhead, my rebalancing is buy-only, no selling, so it's not a perfect analog to QQQ but it's close enough and I at least got some of my capital out of SpaceX.