The modern web: muscular SpongeBob flexing with cutting-edge frameworks and sleek designs. Government websites: derpy SpongeBob looking like he was coded in 1997 using a potato.
Nothing says "we handle your taxes and personal data" quite like a website that looks like it was designed during the Clinton administration. The digital equivalent of using a rotary phone in the age of smartphones.
Fun fact: Some government sites still support Internet Explorer because apparently bureaucracy moves at the speed of continental drift.