I do wonder, every time I see someone recommend 133+ing the vowels ("m0d3ltf0rd"), how many dictionary-attack programs and script try those as a matter-of-cours

I do wonder, every time I see someone recommend 133+ing the vowels ("m0d3ltf0rd"), how many dictionary-attack programs and script try those as a matter-of-course. People who do that don't seem to do it "randomly" - just as in the example used, they tend to change every vowel to a number in a single word (or less often, phrase).