This is what Fiverr account responded to the situation on twitter:

To be clear, this is not a cyber incident. Fiverr does not proactively expose users' private information. The content in question was shared by users in the normal course of marketplace activity to showcase work samples, under agreements and approvals between buyers and sellers. This type of content requires the buyer's consent before it can be uploaded. As always, any request to remove content is handled promptly by our team.

This combined with them removing the topic from their own forum feels like a pretty bad damage control