Their CEO presented the Robinhood chain and tokenized assets on it's chain and app. Robinhood chain will be a permissionless L2. https://robinhood.com/us/en/blockchain/

During this presentation he showcased tokenized OpenAI & SpaceX stocks, using arbitrum https://x.com/TrustlessState/status/1939710544942071923. Looks like the service will start on arbitrum than eventually move to it's own L2.