You ruined our project.

I can't imagine that three downvotes of mine destroyed your project.

So many posts on Steemit are only garbage, in my view.

That's the point! But since #newsteem we have the possibility to take action against such spam.

And I spent much money to collect the data than the rewards I receive in Steemit
even I barely powerdown up until now for the ecosystem for Steemit.

If you have invested at $1 and are now trying to make upvotes and similar to make up for the loss, then this was not a good investment and you should live with it.