No, I don't think it's necessary. It's helpful in circumstances where there are large amounts of money involved, for example. There's research out there suggesting that small incentives actually discourage whistle-blowing, so it's not always appropriate. It's more about protection and valuing the employees who speak up in cases where, for example, there wouldn't be a huge payout in the financial sector.
On February 1st, 2021. See this statement in context.