I don't think feeding pigeons is objectively a bad thing. While I live in a highly urban area and don't doubt they get food, a couple of additional sessions of seeds per week is not going to make them dependent or obese. I generally confirm I am doing something reasonably appropriate by asking my local bird sanctuary.

I don't follow social media at all so not sure if there's a trend going on about feeding birds. A few times someone has shown me clearly fake (i.e. spliced together) videos of animals being "rescued" and living with families. They do make me angry because they are clearly made for views.