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Bidbots are the accounts selling their votes. You send STEEM/SBD to them with a link in the memo, then they upvote the post. You can find an extensive list of the bidbots here: https://steembottracker.com

Sadly these bidbots do not post contents on STEEM themselves, so we cannot punish them by downvotes. Instead, we should punish the customers of the bidbots (which is what my page detects, you can see which % of the upvotes come from bidbots).

I've gotten innumerable memo's in my wallet where this one or that one sent ME $0.0001 with a note inviting me to do this or that and send $x.00 steem for upvotes from their 30K followers.
I have never once responded to any of those things.
I am poor, I make at best $1.50 PER WEEK on my own, so I don't give my
Funds to anyone. I UPVOTE those of my friends and followers who
Have helped me, and I only upvote QUALITY posts that interest me.

Thank you @heimindanger for the explanation