Stop allowing scam adds on your platform. Who is monitoring your adds and banners, which are currently scams about Chinese cryptocurrencies?
John Macey commented
And lots more scam adds about "power saving" devices ... which WILL NOT save domestic power users any power charges... They will just cost you many times the value of the useless electronic components contained in these devices (and maybe give you an electric shock if you touch the terminals)..... They do add to Yahoo's profit at the expense of Yahoo's credibility though.