I couldn't find a picture of it, but he has his wallet address behind his sign as shown on the livestream, so pretty much we know what his intentions were, to monetize from the publicity hes getting.
I'm very active in the DOTA2 community, and I've read multiple posts about that guy with the "Buy Bitcoin" sign. You thought he would get praise like the guy who first did the publicity stunt during Fed Chair Janet Yellen's testimony right? Wrong. Most of the replies I've read on the Dota2 subreddit towards this guy were negative. So yes, even though people from the cryptocurrency community might be celebrating what he did, we're actually getting a bad rap from people outside our community. Which is the exact opposite of what we wanted to achieve.
If the DOTA2 community is hating, that's their problem. All publicity is good publicity. Getting Bitcoin out there in big masses of public is always a good idea. It doesn't matter if some people hate it. When I first heard about Bitcoin, it was on Zerohedge and you know what most people in the comment section have been bashing Bitcoin since day 1 because they are hardcore gold bugs and hate Bitcoin. After reading on it myself, I knew that all the haters were wrong, and got involved.
There's always people like me that will ignore the haters and think for themselves, and thanks to that now I have made a lot more gains than all these goldbugs still on denial about Bitcoin.