There is nothing wrong with identifying content that isn't voted yet, has the potential to be worth $30, upvoting it early, and getting curation rewards. That's exactly what early curators are supposed to do.

Not even if it's bid botted crap downvoted but not enough to take it out of Trending?

I really don't understand what problem you are trying to describe.

Steem (or its front ends) treat promoted content (advertisements) similarly to organic content. Other platforms have slots for advertisements interspersed with eye ball catching organic/curated content.