I think it strongly depends.
I competed as a small teen lightweight a little while ago... and there was NEVER any question that a tan was needed to compete. When you go on stage in an auditorium the stage lights are very bright and will 'wash out' your muscle definition if your skin is too pale. Now you had to work really hard, diet really hard and [maybe] have a lot of [expensive] injections in your bottom to look as good as you can that day so you cannot afford to have your 'cuts' disappear. So as deep a natural tan as you can get THEN either the darkest spray or one of the old fashioned stains OVER your own tan is absolutely necessary.
Even some already dark skinned boys in the contest I was in [south sea Islanders from Samoa or Tonga or Fiji or NZ Maoris] had chosen to enhance their already darker skin.
These really unnatural tans are NOT some kind of eccentricity but essential to present your muscles adequately. It is a serious competition you know, not a beauty contest LOL....
[Stage actors are similarly made up.]
What the boys/girls do about their skin color between shows is their business... whether anyone else approves or not... well so what...