The market makers and exchanges stop executing orders because a series of circuit-breakers fired (set by the regulating organizations). Robinhood and other bro

The market makers and exchanges stop executing orders because a series of circuit-breakers fired (set by the regulating organizations). Robinhood and other brokers don't execute any trades, they just forward orders from users to their exchange partners and show up to date quotes. They have a much easier load to bear than actual exchanges.