This is problem with these platform that anyone can place any ads if they spend some money. If a project needs to be verified by the team or any 3rd party to run ads in google or twitter then we would have seen a quite improvement in the ad industry as well. Though it is practically expensive to do, this is just an idea. Every time I go into twitter some ICO sale pops up or some dude asks about minting NFTs. By seeing all these, I do realize that we should cross check a project to other legit platforms if we get to know about it on social media and interested in it.