"I don't mind not riding any more. I'm nearly 49 and no one will put me up anyway with all this going on."
The Richard Whitaker-trained Rascal In The Mix was making her debut but drifted alarmingly on Betfair from 3.55 out to a high of 25 shortly before the race started.
McKeown added: "Because of Betfair, they've already got an isolated camera on me, they've been waiting for me to do something wrong."
James Willoughby, the Racing Post's chief correspondent, said the withdrawal of McKeown's licence by the BHA was long overdue. He said: "It is absurd that a rider who has been warned off should remain at large.
"It makes a mockery of the sport that a jockey who has been warned off should still be able to affect results."