UK to ban private investigation without a license

Am I missing something? How does said law prevent people from breaking other existing crimes? Is this just another law to slap onto charges, to make it “really, extra, extra, we’re serious this time, illegal”?

Unless they make it very difficult and expensive to get licensed, I can’t imagine how this could prevent people from committing other crimes whilst they are performing “private detective” services. Short of creating a screening process for assholes or criminals who don’t have a record yet, this feels like a pretty hollow change.

(that said, the U.S. requires licenses like this in many areas already)