This is covered in the ToS:
Gig Commercial Use License
By purchasing a “Commercial Use License” with your Gig Order, the Seller grants you a perpetual, exclusive, non-transferable, worldwide license to use the purchased delivery for Permitted Commercial Purposes. For the avoidance of doubt, the Seller retains all ownership rights. “Permitted Commercial Purposes” means any business related use, such as (by way of example) advertising, promotion, creating web pages, integration into product, software or other business related tools etc., and strictly excludes any illegal, immoral or defamatory purpose. This License is subject to Fiverr’s Terms of Service. There is no warranty, express or implied, with the purchase of this delivery, including with respect to fitness for a particular purpose. Neither the Seller nor Fiverr will be liable for any claims, or incidental, consequential or other damages arising out of this license, the delivery or your use of the delivery.