I’d expect the proportion of people using Strava in a race would be much higher than normal
not sure, you get timing anyway, and its extra weight and faff.
I use it in races, but I think its less than half who do (based on flybys etc).
The thing I always wonder about is, round trail centres especially, how many people are going full blat. I find I am sometimes about the same time as ‘names’ who i know are way faster than me, but for all i know they could have just been crusing along on a social ride