I worked for too long on mobile games, ads mediation company are indeed the worst, IronSource included. It's a nightmare to work with their black box SDKs, and god knows what they do in that, in addition to tracking and showing ads (do you know some ads can take up more than 200MB ? That's sometimes more than the game I worked on...)

I hope this will incite more developers to look into open source game engine such as Godot and find better way to monetize games than ads.