I think the biggest problem in these day of crypto world is scammers and hackers. Because they're so dangerous for us and can make us loss our money instantly. And of course we have to aware with that.
They might be a problem, but if we will be looking it at the opposite direction, they are the reason why there are a lot of people and sites that makes their way to improve their securities. With these hackers or scammers, there will be a lot of people getting cautious to what they are doing and whenever they are making their transactions.