G2a.com and steam I know for sure that are accepting bitcoin, as for ps4 I have no idea, you can probably find someone here on the forums selling games or keys for games.
btw, here's the list of businesses that accept bitcoin, might not be a full lit but still a list whatsoever:
https://99bitcoins.com/who-accepts-bitcoins-payment-companies-stores-take-bitcoins/
I've heard g2a is very bad for the developers. They make practically no money from the keys and some keys may be stolen as well. G2a also has a very terrible support system. I'd say just buy straight off of steam during sales and such to help the developers too.