Valorant cheater reports are now being trialed, meaning that if someone you you reported gets banned, you’ll get an announcement just like the one Ninja received.
Paul Camberlain, who works for Valorant and is in charge of their anti-cheat program, stated that these messages are ‘currently experimental’, meaning it’s possible they may change or be removed temporarily while they work on the system. He also added that the cheater banned message should show the cheater ID.
Don’t expect to log in and see these messages waiting for you, though. These will only appear if the ban occurs while you are in Valorant at the time of the ban.