@kslo

Yeah, I noticed the same thing when I leaved minergate. Their software is not open source so we do not know what might be running they can easily be using a small amount of our cpu to mine for them. About bytecoin, I will link a comment made by a user named keledoro on reddit! I will suggest you to read the first link, its pretty interesting!

Yep, scam.
(1) Pre-mine, faking proofs etc.: https://bitcointalk.org/index.php?topic=740112.0
(2) Exploiting the cryptonote bug and creating a couple of BCN: https://monero.stackexchange.com/questions/4241/how-does-the-recent-patched-key-image-exploit-work-in-practice/4252#4252