Robinhood cannot easily expand its product base because a majority of their current revenue is from selling order flow. Most of the products you listed as well

Robinhood cannot easily expand its product base because a majority of their current revenue is from selling order flow. Most of the products you listed as well as other seemingly easy to offer products are going to be tough to sell to someone because there's no easy way to offer free/cheap transactions. It's very tough to convert a non-paying customer base to a paying one. Additionally, at least for mortgages and bonds, I don't see how Robinhood would ever be able to be competitive in either of those spaces.