This alliteration is also present in the third verse:
I’ve been fobbed off, and I’ve been fooledThese lines also demonstrate anaphora with the repetition of "I've been" and internal rhyme with "fobbed" and "robbed."
I’ve been robbed and ridiculed
The third line of the final verse is also alliterative: "Oh, the sweet smell of success."
In the first two verses that feature the alliteration, there are also pairs of opposites. In the first verse, it's in the line "Been sent up, and I’ve been shot down," with the opposites up and down. And in the third line of the third verse - "In day care centers and night schools" - the opposites are day and night.