They could, but I don't think that is a good idea, because they need money to reprogram that game to put the crypto payment options, and it depends if they will based on the marketing survey that they will conduct just in case they really wanted to implement this kind of strategy to raise their profits, the only problem or they might think to reject this idea because only few people owns or know cryptocurrency, and those people don't even go the arcade to play that game, they play their own games, I assume.
And the majority of the people who plays that fish in the arcade are not crypto owners, that is why you're going to have second thoughts with this idea, though it is good, but you're going to need time to come up with a very hard decision about implementing it or not.
They can make a survey or poll on their site, and give a reward for their participants, so they know what people react about the new form of that game. I think that it will look like a marketing strategy to develop a new form from the old form. Besides that, if people are familiar with the game, and they have an old memory with the game, I think that people will give supports and maybe they can give a suggestion for that game.
I agree with you that they really need to think about the time how to upgrade their game and integrate the payment system. But that will attract new people to play the game, and I am sure if they can modify the design to look better than the old version, it will be attractive too.