Robinhood is a known entity in trading.
Robinhoodchain strives to be permisionless and is build on Ethereum-compatible Layer-2 blockchain, that alone makes it a no go for me.
Still others are way less finiquite or more adventurous or just have more funds to play with.
Robinhood Chain is a permissionless, Ethereum-compatible Layer-2 blockchain built to support a new era of onchain financial infrastructure — one that brings traditional markets, crypto, and real-world assets together on a fast, efficient, and open network.
Robinhood Chain is part of Robinhood's broader mission to democratize access to global financial markets and to empower users and developers with modern blockchain tools. It is designed to enable the seamless transfer, access, and management of digital assets anywhere in the world, without intermediaries or platform lock-in.
https://docs.robinhood.com/chain/Can a non US Citizen now trade US shares?