[Nadya]

League of Legends offers a colorblind mode in game that does exactly that - changes the teams to Blue and Red from Blue and Purple.

IIRC, they even use that mode for their E-sports tournament streams - but I might be wrong on that as I haven't watched any LoL tournaments in quite some time.

E: Just tuned into the EU LCS to take a screenshot - and it has colorblind mode on: https://vgy.me/ijQgrR.png

[Fnoord]

World of Warcraft got colorblind mode in patch 6.1 (around feb 2015) [1]. Before that, one needed to achieve this via addons (with varying effect).

[1] https://worldofwarcraft.com/en-us/news/17964863

[discreditable]

I'm not colorblind and I use colorblind mode just because I think it looks better!