"Committee investigators should examine any retail services freezing stock purchases [...] especially those allowing sales, but freezing purchases."
Apparently she would prefer that people were blocked from selling their holdings.
"We now need to know more about @RobinhoodApp’s decision to block retail investors from purchasing stock while hedge funds are freely able to trade the stock as they see fit."
Of course, in reality, the only services freezing stock purchases are those allowing sales but freezing purchases. Because freezing sales in addtion to purchases would be much more problematic, not less.
A brokerage NOT allowing buys, sells, margins, options on a security is well within their right to do so. It's only when they start to take positions that limit an investor's ability to manage their own risk that it gets a little fishy...