The solution is to have so many people want visibility that the bidbots are a cost not an ROI.
This is the model that every content creation site I've ever heard of uses.
Including youtube, twitter and even facebook provide ways to promote content.
If people are unhappy with the results they should flag.
Also, your review misses a couple important points.
People often BUY steem to promote. I've done it many times.
No matter what the ROI is, 1/2 of the value is powered up for 13 weeks.
Have a great day!