My biggest issue is not necessarily the how but what to do when an app doesn’t identify as such. For native advertising it isn’t that big a problem. Then again greed can incite all possible wrongs.

I think it wouldn’t be too big a problem to develop SteemConnect as the auth layer for the blockchain. This can be fully decentralised and apps can target their own nodes or just happen via a default auth.steem.io.

The question is what next. Once the instance is in place we could operate even without any API while still count access requests and determine based on daily usage.

But this being open source, who defines what is commercial and what is pro bono. And what ramification options are available when apps identify (maliciously) wrongly as pro bono app. Also who decides over the ramifications?

Blockchain explorer and all similar tools would be pro bono apps as such. Commercial upvote bots are easy to identify as well. But what with voting trails? How will we determine whether a user uses them for profit or just out of laziness? Cap the number of daily uses and charge the used app beyond that number for each user?

I predict revolutions and forks, by witnesses, long before any HF with such dual citizenship happens. I think Steem Inc may even be easiest party to get on board.