Qi chargers have been around long enough to where I thought that one cannot still buy one that charges so slowly that it is pointless, but these ones are just that - another useless piece of hardware. And I bought two of them!
And just in case someone is about the blame the actual power supply - I tried literally 7 different power supplies, all quality ones, all with enough power, and no, I did not try to charge though the case. It does charge, but try keeping the screen on, and it'll actually lose power. This was with Google Pixel 5.