cool, quite why the printer manufacturers don't use better bed materials is a mystery.
a thin sheet of PEI is very cheap.
The trend of printers without heated beds seems, thankfully, to be dying out - so PEI is an ideal place to start and sell printers that are much easier to use.

That said creality seem to be selling boatloads of ender 3's and they just don't seem to work at all.
Why people are still buying them is a mystery to me.