Deleted

Hmm they were always advertising it, even last month, but I don't see the option at the moment. I didn't buy anything myself so I'm not sure how it works. But if you follow their page on Steam they always like to tell you when they are having crypto sales. Otherwise just ask them on their page and maybe someone who has bought before will fill you in. But you were able to buy any games in the store and you got a discount for paying with crypto.

EDIT: Just went to their store and when you check out it shows various options like bitcoin, ethereum, and litecoin

Paypal could change. Right now its in extra step of gift cards or bank account (dont know what Paypal fees are for Bitcoin).

Only direct Bitcoin for Steam games I can come up with is Newegg.com