I think the point the tuttle7 was trying to make was that this site could be implemented client-side quite easily. There's no real reason to make the translation server-side and require more server CPU resources and bandwidth.

I feel the same way about https://www.base64decode.org/ . By default, everything gets translated server-side. I wonder how many people use this site on a regular basis for translating secrets. I'd bet my life that the number is greater than zero.