We try to avoid Advertisement as much as possible but If it's not possible to be sustainable with donation + blockchain incentive, we have other solutions including Ads
(Note: I am not a lawyer and this is not legal advice.)
Note well that simply because content is in the blockchain does not mean that the author has given you any rights to profit from it. Everything I post into the blockchain, for example, I retain copyright on and reserve all rights to. Without a specific license from the owner of the content, profiting from ads displayed on/beside the content may well expose you to significant liability. Publishing data into the blockchain doesn't give everyone who downloads that blockchain the right to profit from that data.
I totally agree with your statement and vision. This is one of the reason for which we really want to avoid ads.
That's also why I didnt mention Google Ad for example but simply Advertising as a more global concept to-be-defined. Adding Advertising would require more profound reflection on the exact model considering the point you described pretty well.
Simply sharing a few thoughts with you, However it's not on Busy roadmap and may never be