I copy pasted that because I have two basically identical arguments rn, just wanted to add that I do have a ad blocker but that doesn't work everywhere ads are shown, especially IRL...

It's not about smart or stupid, ads use various mechanisms to manipulate you and noone is completely immune to them, when you spend your money it's too late already because you have bias no matter how slight it is and once you are presented with two idendically good products that bias starts to show. Here is a great German video on the topic, I don't know if the subtitles are usable but it's far too big and complex to explain in a single comment and I don't care to try rn: https://www.youtube.com/watch?v=etkeGVNRVYA