Ad Filters? How do you use various Ad networks without ad category filters?

How do you use Ad networks such as Appodeal, Fyber, Mopub etc etc, when they don’t have Ad filters?

Most of my apps are rated Pegi3 and I am forced to set various ad filters and therefore I am limited to very few ad networks, is there a way to avoid this?

MoPub has 4 filter levels (Strict, Moderate, Low, None).

Yeah but what about Appodeal, Fyber and other popular ad networks, as far as I know they don’t have(if any) filters yet people use them in their apps and I refuse to believe that they are used in pegi18 apps