Normal ligatures look like the letters they represent. Look at "fish" for example. The ligature exists to make the dot on the i not conflict with the overhanging part of the f. These WTF and LOL ligatures don't look anything like the word they replace, so they should just be called "random new characters", not ligatures.
Also, not all commonly used words get a special character. The, an, is, be, are, are more common than "et" and "at", but they don't have their own character.
Anyway, I think this is more of an art project than anything else.
Normal ligatures look like the letters they represent. Look at "fish" for example. The ligature exists to make the dot on the i not conflict with the overhanging part of the f. These WTF and LOL ligatures don't look anything like the word they replace, so they should just be called "random new characters", not ligatures.
Also, not all commonly used words get a special character. The, an, is, be, are, are more common than "et" and "at", but they don't have their own character.
Anyway, I think this is more of an art project than anything else.