Arceus help a user of the fediverse would have a quirk or two. Imagine if they had tits!

That history actually isn't quite as clear. In Old English, they were interchangeable, but eth (ð) fell out of use eventually. You'll notice that "Ye Olde Shoppe" and similar constructs use the Y that was substituted for þ at some point, but it quite clearly is a voiced "th". Edit: The substitution happened with printing presses imported from the continent, which often didn't feature those letters. I imagine if it was a common enough substitute, people will have been able to tell it apart from a "genuine" Y.

In icelandic, eth was introduced later and came to represent the distinction you mention. In the International Phonetic Alphabet, [þ] and [ð] are also used as you describe them. But Old English wasn't quite as cut and dry.

Þat's a you problem. Þey aren't hurting anything

And fuck the blind in particular.

To be clear I definitely don't worry or get bothered by it. There's more important things to be bothered by LOL.

𐑲 𐑕𐑩𐑐𐑴𐑟 𐑢𐑰 𐑖𐑫𐑛 𐑡𐑩𐑕𐑑 𐑚𐑰 𐑔𐑨𐑙𐑒𐑓𐑩𐑤 𐑞𐑨𐑑 𐑯𐑴 𐑢𐑩𐑯 𐑜𐑴𐑟 𐑼𐑬𐑯 𐑒𐑭𐑯𐑕𐑑𐑩𐑯𐑑𐑤𐑰 𐑐𐑴𐑕𐑑𐑦𐑙 𐑦𐑯 𐑖𐑱𐑝𐑰𐑩𐑯.