Drag racing a Roadster is a lot different than drag racing an ICE car. Drag racing it puts little more stress on it than a hard launch from a stop light. The torque output of the electric motor is totally controlled by the computer(s) in between the accelerator pedal sensor and the motor drive IGBT's. If it can't handle a straight accelerated run down a smooth pavement to reach 100mph, it really has no business being out on public streets! On the other hand, an ICE car, what with revving the engine to redline (or past), popping the clutch ... yeah, for sure I'd be leery of buying that.
It's never been attached to any "charger" except for the one that's built into it, which is a part of the PEM. It has been attached to charging stations (aka Connectors, in Tesla parlance), but those are nothing more than glorified extension cords, with user safety features built into them. Even the pilot signal is designed to protect the car under normal conditions. Any damage to the Roadster from using "non-approved" charging stations is much more likely to come from whatever voltage spikes that came off of the power grid that the charging station was attached to. That sort of damage would have happened even if a Tesla connector were used.