I would guess they gained more users than they lost.
The outrage was real and obviously some users left, but at the end of the day most people will still use whatever platform is easiest and cheapest for them.
Any news is good news. They gained a surge of users when they had that huge outage when COVID first hit. People overestimate the degree to which anyone cares about the controversy, and underestimate the degree to which it's free advertising.
But they aren't anywhere near as seamless or slick as Robinhood. I exclusively use Charles Schwab but I don't even really think they're competing for the same type of users that much.