Firstly, Thank you for reading Chris!
Secondly, Yes! There is a possibility for people to take advantage of Web3, In fact, it's already happening!
Since using most of the produces of Web3 means that you can do any activity both honest and nefarious and still be anonymous, people who don't have the best intentions at heart can use it for their evil gains and totally get away with it.
Sadly, there is no definitive way to stop or even identify these people. At least, non to my knowledge at the moment.