We're not sure what their expectations are - and as we've explained, they're not going to see their ads fill on every visit unless they are outbidding the Ezoic ad partners.
If they're saying they're not seeing any ads, including non-Gourmet ads, that could be due to use of a VPN, access from a restricted country (Russia for instance) or visiting from a crawler and not a browser window as a visitor. It's not really something we'd be responsible for troubleshooting.
Again, it sounds like there's a misunderstanding from the outset.
Third-party ads are not going to show alongside Ezoic unless they outbid our ad partners. That's how Mediation works - if they bid higher for an ad location, their ad fills to the Ezoic placeholder setup.