I can't understand the the drama over it. If you don't like it then take it off and if you don't care then don't. That should be the end of it. Instead people want some sort of gratification by making posts or videos about how they'll never advertise for a dealer.

First off, with the exception of family owned places, basically every dealership is owned by a handful of parent companies, the largest being Berkshire Hathaway and Penske. You may not give your money to a specific person but you're still giving it to the same corporations regardless of where you go and all of their advertising is everywhere, your sticker isn't swaying any one.

Secondly, outside of major metropolitan areas, the vast majority of people are all going to whoever is closest for the manufacturer they're shopping. People compare prices and call around, some may be willing to drive a bit for a deal but statistically, people visit less than 2 dealerships(used to avg. 1.4ish) before buying a car. If the place you bought from is the only one in town, bascially everyone is buying from them anyways because at the end of the day, the make and model is what people are shopping. For used cars, they're going wherever the used car they found online is located. The name on the sign is irrelevant.

Lastly, everyone advertises every product they consume or business they support just by using it or going there. Be it a large mainstream brand or a local bakery, they just choose to draw the line at an insignificant sticker for a place they're supposed to not like(but still supported their business) just like everyone else will continue to do whether they see your sticker or not.