It was interesting discussion if it is ok to calculate the ease of getting red using percent of reds. But even it is not ok I was determinated to know what part every color takes if we exclude users who took part in few contest. About an half of users leaves CF before their 5th contest. I have not any stats about robots though)
So for human stats looks so:
If minimal number of contests is 5:
You can try other parameters on interactive dashboard. Hover the mouse over color areas to see more details.
Script code is here.
What happened in May 2020?
Rating system changed which caused some deflation