What will end up happening is that bigger advertisers will spam the hell out of everyone, so people will start ignoring/blocking all ads, including more benign sub-specific ones.
A much better option would be to give users an option of suppressing cross-sub ads. This will still show sub's ads when a user is on the sub, which is something that people may actually want.
Strict relevancy of the ads is the key here. This is what reddit ads have had going for them before this change and it was their biggest and unique strength.
What will end up happening is that bigger advertisers will spam the hell out of everyone, so people will start ignoring/blocking all ads, including more benign sub-specific ones.
A much better option would be to give users an option of suppressing cross-sub ads. This will still show sub's ads when a user is on the sub, which is something that people may actually want.
Strict relevancy of the ads is the key here. This is what reddit ads have had going for them before this change and it was their biggest and unique strength.