I can imagine a very reasonable argument for this. Someone who puts a Confederate flag on their car seems highly likely to engage in other toxic behaviors. Just like someone who calls someone a nigger once is likely to do it again. So we use the behaviors as a signal of underlying tendency. We don't want people who have this tendency on the platform because they will tend to make life worse for other users, and the loss of their business hurts us less than we gain from other people feeling more comfortable. Therefore we ban them.
On the other hand, too many on gaming platforms are engaging in clearly racist behaviour, ie. choosing offensive nicks, spamming chat, and need correction.
But not the people who have the authority to make the call, plainly.