I am curious to know what to do when atc tells me that my takeoff clearance has been canceled, but I am past V1
In that unlikely scenario you continue your takeoff.
Oh, ok thank you very much.
Once you have passed V1, you cannot reject the takeoff. However, this only applies if you have an accurate V1 speed, not something extremely low. The controller can’t know your V1 speed but should still not be cancelling TO clearance when your speed is that high. Usually TO clearance will be cancelled at lower speeds if it is needed.
Ya just processed with your takeoff
Ok. Thank you very much, a MOD can close this now