> Of course, each one of these games also has at least one type of currency unique to the game, which you can only convert in one direction, nor is there any way to move currency in the "store". Often that currency, and anything you bought with it, is locked to the particular platform on which it was purchased.

On steam and GoG you pay with government issued currency. If the others have a currency system just hard pass on them. If you could cure yourself of Gacha, you can do it.