Does PlayFab advertising have support for desktop ads?

PlayFab is a complete backend platform for live games with managed game services, real-time analytics, and LiveOps. PlayFab Rewarded ads let your players choose to watch a short video in exchange for an incentive. PlayFab Rewarded ads will reward the player based on the completeness of the player watching the advertisement. This info should be provided by the SDK of your advertisement provider. If you think these features can satisfy what you mean by desktop ads, then you can implement it with PlayFab.