The SEC has returned $4.6 million to investors who participated in the BitClave ICO, which was based on the Ethereum platform. This move by the SEC aims to protect investors and ensure that they are not harmed by fraudulent activities in the cryptocurrency space. The return of funds is a positive step towards holding companies accountable for their actions and providing restitution to those who may have been affected. It is important for investors to be cautious when participating in ICOs and to thoroughly research the projects they are investing in to avoid potential scams.