Although I like the idea of incentivizing burning of STEEM, I have recently argued in The Sustainability of Steem - Is Freemium Broken? that ads are ultimately not what users should want, even though it might make the platform (more) sustainable.
The problem is that the goals of advertisers are always different than those of users. Placing irrelevant posts into the feed will always degrade user experience. And if the posts are not irrelevant, then they don't need paid promotion (they need recommendation, better organic reach).
Interfaces might act on the incentive of taking a cut of the promotion, but it will still be just fixing of one freemium model (the current, based on speculators) with another freemium model (based on ads).
Posted using Steeve, an AI-powered Steem interface
RE: A Simple Way to Strengthen the STEEM Economy