This is really cool!

Although I already have my suspicions that most advertising data is worthless already.

I still think it's far more worth it to just simply not even download ads in the first place, since it saves a pretty significant amount of bandwidth, which is likely to be especially useful for phone users and other metered connections

You surly save bandwidth, although I would recommend to stay away from AdBlock Plus who are plainly extorting content creators with their "acceptable ads" scheme. If you need a browser extension use ublock origin or better yet use device wide DNS filtering instead.

I can vouch for ublock origin. Dns level filtering can be a pain but there's always the good old fashioned hosts file