Hi guys!

I found this program called steam idle master and I wanted to check it out because it was interesting. I looked up a guide on the internet and I tried it out. I let it run for 3 à 4 hours, but I didn't get one trading card. I was not playing any game and I was afk the whole time. I did the same steps as everyone else, but they get their trading cards and I don't. Can someone please help me?

Thanks