What control over the human Uber/Lyft driver, whom you've never met before, do you have?
Self preservation.
You control someone else's self preservation? That doesn't make sense to me unless you're suggesting the passenger also threaten the driver. Did you answer the question they actually asked?
Ostensibly, the Uber/Lyft driver is also feeling threatened and will gun the throttle in an attempt to escape the situation, even if an attacker is directly in front.