They're hardly more accessible to blind people than any other kind of graphic, and if they're used on websites they can be hard to navigate past unless they're set to be hidden to screen readers.

related: Are unicode emojis like 😀 more accessible than emoticons like :D ?

They're annoying, honestly. Now, I do play games which draw maps using ASCII, but that's different from just using it to draw arbitrary shapes or whatever. The latter would be a lot more irritating.

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