I should use mopub?

Many examples of account suspended on the Internet.

I am looking for a banner ad for admob backfilling.
Admob banner fill rate is getting lower and lower.

Many people in Inmobi have been defrauded and really dare not use it.
The famous vungle applovin has no banners.

I hope someone can provide advice.
Thank you~

You could maybe try CPA? Not much information provided to help you out though.