I know several people that used Bitcoin to buy Steam games. In fact, Steam gift cards have always been sold in the marketplace on this forum, as there is significant overlap between Bitcoin's user base and gamers. But even if you don't do it yourself or know anyone that does, I think the point of the thread is that some merchants are dropping Bitcoin due to network congestion and transaction fees.
The bigger issue here is Bitpay. Rather than upgrading to Segwit to get an instant ~2x drop in fees, they've begun charging users a "network fee" that reflects current Bitcoin transaction fees. The spam attacks don't help, either.