This is very interesting. Unbelievable how much abuse is being done on steemit.
As a new member, such info is important for us to avoid being scammed to paying what little we had to get upvotes only to find that they are a waste of our efforts and money.
Although a bit late, I am glad to hear about @ubg being a scammer. Although I noticed something fishy, I still wasn't sure about it.
The story is that I have started an initiative to share any SBD payouts I gain with all upvoters of my posts. True to my word, I did and I noticed that I had few people upvoting regularly, which nothing wrong with it of course.
As another initiative to help fellow minnows, I started visiting these people to upvote some of their posts as a thank you and as a mean of support (although my SP is low). Doing that allowed me to notice that some of the upvoters were either not active at all or haven't been active for a long time. @ubg was one that was not active regularly but always appears with another acount @nrg that was not active at all..
Hearing about all the scamming that happens on steemit, I decided to change the rules for SBD sharing to encourage real people to comment on the posts, to deserve their share and to increase human interaction.
Of course, I haven't heard any comments from some so far, including @ubg or @nrg.

Thanks again for sharing this important info.
Please keep up the great work to stop such abuse from growing.