IMO a bad idea, ads help with discoverability and is one of the most effective mechanism for growth. This includes for small and big businesses.
I think it makes more sense to target what kind of ads should be banned (e.g. politics, alcohol, cigarets, religion, etc.) and what ads format should be banned (e.g. loud ads, ads in the subway, etc.)
I get that you're upset at ads in general, because they're on your face all the time, but banning them out right doesn't seem right. I mean this is what keeps a lot of very useful services free.
I think it makes more sense to target what kind of ads should be banned (e.g. politics, alcohol, cigarets, religion, etc.) and what ads format should be banned (e.g. loud ads, ads in the subway, etc.)