That seems quite a lot of fraud crimes. I'm surprised.
Not really - bear in mind that they will use the term "economic crimes" to cover all sorts of things, even if it's rather minor.
Worth pointing out that freepl.info is also the Opposition mouthpiece - what they're not saying is exactly what these crimes are. They will be mostly small, petty things that we would never class as an "economic crime" and are barely worth mentioning. The line at the end of Poland being "full of tricksters and swindlers" is just the usual garbage from Gazeta Polska.
Worth also pointing out that PiS did very little to improve the justice system, instead preferring to use it to pursue their own agendas.