Not sure where this fits but an advertiser in Mystic Vision (Viralaspect) claims to have been around for years but their website has only been around for just over a week. There are a lot of scams going on with COVID masks and this could be one.
That should probably be reported to Google. They likely control advertiser content.
@nevarmaor has this right, any concerns about ads should be reported through the ad platform. Small Giant has no control over individual ads that are shown.
Do you have targeted ads enabled? Have you been searching Google for coronavirus cures or treatments (or even information)? That would lead to ads such as these. Still inappropriate if a scam and Google should be made aware of this.
This is why I use DuckDuckGo.