Actually the magnification is shockingly good, enough to find tardigrades and microorganisms. The Raspberry Pi Cam is the default low cost sensor option of the OpenFlexure 3D printed microscope which for less cost than this Lego kit competes with extremely expensive lab grade microscopes.

In OpenFlexure PiCam mode, the lens from the PiCam is removed and inverted and spaced at a distance, giving a higher magnification than the digital camera in default configuration.

https://opg.optica.org/DirectPDFAccess/445C5C67-0A08-4C06-8A...

I prefer to use AmScope objectives in my 3D printed microscope, but my kids find all kind of wonders using the cheap PiCam setup. I think it’s about equivalent to 20x objective magnification.