Steve F. doesn't give a shit if Joe's birthday is happy or not.
Just like every other aspect of working, sending coworkers birthday cards from everyone else in the office is annoying and only gets more oppressive with every passing year. There are only so many ways you can turn your one inside joke with the tech guy into a birthday greeting. That's why this year we're sending our coworkers "Happy Birthday Forever" cards to cover all subsequent birthdays. But we still support someone bringing in cupcakes. We're not monsters.