“Protestants” couldn’t conceal a Catholic-size sexual abuse scandal if they tried because they’re not under a central hierarchy for starters. “Protestants” also will knock the dust off their shoes and vote with their feet the minute a church starts going bad, too, so there’s a monetary motivation for denominational leaders to come clean and stay clean. Crooks and perverts exist even in churches, of all kinds, this is a fallen and sinful world. But, there are no protected dark cellars and attics for them to hide in, not for long, unlike the Roman Catholic church which has demonstrably protected and concealed such individuals for a very long time.
Were that the case, there would be no "bad" protestant churches. There would be no flaming liberal denominations. Unfortunately, Protestants are just as susceptible as anyone. And, the financial angle could just as easily cause some people in leadership to precipitate a cover up to protect their own position. Who knows what evil lurks in the hearts of men.