They provide their own charger. It works, I’ve got one.
It doesn't matter how cheap their charger is, no one should need to even buy one. RasPi botched their USB-C implementation, and the solution to that is not "buy yet another charger", it should be "we're fixing the design immediately, and it's going to cost us a fair bit but you can send your board back to get it replaced"
Mine, that can charge my gpd pocket can barely power my pi4.
I still see the yellow lightening bolt which indicates a "poor" power supply - which is just plain lying.