[just_observing]

That subreddit is not anti-advertising.

Reddit runs a lot of ads where people will link to Amazon with their own affiliate tag. So they are selling nothing, not really promoting anything, just trying to get their affiliate cookie planted in as many browsers as possible. There is also at least one sales aggregator site (which just scrapes price feeds) which does the same. It is that sort of ad which the sub readers do not like.

A genuine ad from a company would be welcome but as you have pointed out Amazon and others have built their rep without ads so finding a reason for them to suddenly spend is going to be hard.