Remove scam advertising.
Yahoo is allowing scam advertising to occur. Who cares if it is via Google adverts or similar. Yahoo is allowing it and is therefore complicit. This advert https://www.abc.net.au/news/2020-07-10/warning-over-bitcoin-scam-using-celebrities-to-promote-product/12441920 has been advertised to me from Yahoo's main page all day; and I've seen similar variations many times historically on Yahoo.
Yahoo needs to take responsibility and show it is a community player supporting its users.