That's not correct; it's like saying Ford Motor Co. was the largest operator of taxicabs in 2000 because the Ford Crown Victoria was popularly in taxi service. Of course, Ford operated zero taxicabs.
Automattic's main product is WordPress, a piece of content management software that many companies use for their web sites. Automattic also provide hosting services for that software. That business is big, maybe a couple hundred million in revenue a year, but not anything compared to GoDaddy, which is a $3.5 billion revenue company.