Each of those "crypto giveaway scams" have their own youtube video page/channel (separate from the video you were intentionally watching).
To fight them, we must find those specific advert vid pages and report to Youtube.
I seen a thread on r/cardano where they seem to be fighting it well -
https://www.reddit.com/r/cardano/com..._cardano_just/
Shocking how Youtube accepts/approves these scam adverts
