They are pre-screening - they aren't looking for you. So it's only a problem for people who don't like gaming.

If the entire tech world did this, then yes, it would be a problem.

I like gaming - but I really don't want to work for a place where gaming dictates the conversation. So in this case, I know I wouldn't want to work at this outfit... so for me it's not a problem, it's helpful information.