I'm behind Smartsteem.com, but I've always been very open about it (https://therealwolf.me/projects, https://smartsteem.com/about). Most people don't know this, but I actually thought quite a few times about stopping it altogether. However, the truth is that this wouldn't change anything. It would simply shift more weight to those bid-bot/promotion actors who are not caring at all about removing promotion/votes from abusers/plagiarists/spammers. In contrast, Smartsteem has already blacklisted quite a lot of people:
https://github.com/smartsteem/blacklist

And there are indeed good actors who are relying on promotion services to get seen!

Now, it's true that it could be done more and better. And I'm always trying to improve the process. However, if I'd blacklist everyone who even slightly promotes a bit too much, (not referring to real abusers) I'm not sure if Smartsteem would have any more customers. Which would have the same result as quitting all-together, since delegators & vote-sellers wouldn't earn as much in comparison to other actors who are allowing anything, so people would switch over.

But with the downvote pool, even those actors (who previously didn't care) would be somewhat forced to use a blacklisting system, which means Smartsteem could be even stricter!

Now, I obv. can't guarantee that it will work out exactly like this, but I do believe (& hope) so, which is why I'm in favour of the EiP. It will not make the life of the average bid-bot operators easier, in contrast, it will make it more difficult.