LinkedIn has a clear advantage here over the other freelancer marketplaces (Fiverr, and Upwork) especially in the unsaturated specialized knowledge sub-fields of technology. Although this feature will be gamified, in the first year at least, the freelancers (assuming they are existing LinkedIn Users) available on the platform will have:
1. Somewhat reliable employment history
2. Similarly reliable educational credentials
3. Code contribution metrics available via a Github integration
4. Reviews provided by authentic customers who also have LinkedIn accounts
A simple verification process here will ensure that the reviews are authentic, thereby ensuring trust in the ratings of each freelancer.
LinkedIn's network is a massive advantage for the sort of gigs the other sites don't offer. Want to find an mid level executive with expertise in X in the field of Y to spend a few hours solving a problem? They're almost certainly not on Fiverr or Upwork, but almost certainly have a LinkedIn profile, and some of them will have them time and the inclination to do a bit of consulting work if LinkedIn presents the opportunity to them.