As a web developer myself, I know it would be hard or almost impossible for an automated system to tell what posts were being promoted by bots and which weren't and to create a long-term solution such as an SP user limit for bots and pushing bot promoted content to promoted, because the bots are an external system.
I'm sure there is something out there that developers are working on. Most likely from the private/user sector. Perhaps the core devs have their eye on this and are watching to see how the community responds... maybe.
Thanks for your suggestions! It's important to be results-oriented sometimes.