Junk all over

My feed recently got so much poluted with all kinds of junk, that it made me finally mad. Most of that junk has been resteemed by accounts of which I think I've never heard before. All kinds of bots, wanabe-whales, etc etc.
So I made a decision - CLEAN UP TIME has came.
This morning I started to unfollow most malicious resteamers. Some I have even muted. To my big surprise, soon I noticed that some of them are re-apearing again on my list of "followed" accounts.

I got hooked. After while only few dozens of steemitians, who I know very well and personaly, were left there.

Hive account@a-0-0 is by far the most poisoning and nasty

With my list shortened to about 15 accounts, I soon realized that Hive account@a-0-0 is reappearing again and again, on the top of my "followed" accounts. I have MUTED, unfollowed him numerous times, however no matter what i do, in just 3-5 minutes it is reappearing again, automatically, right on the top. Automatically, after few minutes I MUTE him. And he was not alone, Hive account@a-0-0-0-0-0-0 is coming next to him as well, very quick. But Hive account@a-0-0 (a.k.a Hive account@bible.com) is by far the most nasty one.

Then I went further, and removed everyone from my follow list. For a few minutes the list was empty. Zero. Before the first two abusers reapeared.

Then i got my wife's call for breakfast. After few hours, once I came back to my PC, this was waiting for me. 42 followers !!!!

And here is a full list of them:

Hive account@a-0-0 seeks for world TOP-3

I made a small research is anyone talking about account. Google fave no clue. Steemworld.org however soon pointed me to numerous mentiones, where this acct is recognised as firm #4 in the world as most rich of followers

Hive account@a-0-0 was created by anonymous route, and his delegation links did not put much more clearance on all this either. And even I find more details, who exactly is behind all this - can i do much about this ? Most likelly - NO. This is the realities of decentralised, sencorless world, which every steem user shall clearly understand.

I believe such new follows are not possible without having my posting private key. I have used several bots in the past, for automatic upvotes, vote sales, etc. , and most of them got my priv key.
Which of them has leaked my privkey to the nasty hands of Hive account@a-0-0, is probably not easy to find. So I will not name any of these services today, to avoid puting bad smell on innocent services.

Few other countermeasures are considered. I will update on them after some time, if they will be successful.

Have you any info ?

In the mean time, I would like to hear if anyone else gas suffered from such a problems, and how do you deal with them. I would like also to hear from any steem devs and/or smart geeks, who has buch better understanding of all technical nie-grities of blockchain (and steemit in particular) anatomy.
I very much wish to understand theses things better. It is so intriquing and chalenging.
Unfortunately, I am not a coder, nor a top-noch geek.

Hive account@cryptoburner