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Yeah it is hard to spot a game service company or literally a game that accept any form of cryptocurrencies. However, I have read an online article that there's a game service company which is Steam have once used to accept Bitcoin but due to high fees and volatility of crypto they terminate this kind of method. According to Steam they might still reconsider of bringing back this payment method if Bitcoin becomes more stable.
Thankfully I can buy my Steam Credits easily. If you reside in the Philippines, there's an app called Coins.ph and you can buy Steam Credits in 1:1 rate. It isn't direct as what you had said that buying games through cryptos but it pretty much ends up at the same thing.
I would love for Steam to allow cryptos to buy their games again, but I hope the rates is still the same because in any case I would stay in the method I am using to buy Steam Credits.