Personally, I found this section of their press release to be way more appalling than the Fiverr acquisition:

We were happy chugging along as a 10-person punk rock company doing punk rock things...

Cringe.

Upon announcement of the acquisition, Design Twitter started doing what they do best – deleting accounts and posting indignant screenshots.

I've never used Working Not Working so I don't really care. (I'm actually not even anti-Fiverr.)

But man, the founder seems incredibly mature and level-headed. Hooray for him I guess. 

Have you guys used Working Not Working?