It is a fact that karma does come back. It doesn't matter what kind it is.
Some people don't care at all, "you see in this forum and real life", even if they get bad karma. They just continue in the direction they have decided for themselves.
I have noticed that if someone does so-called bad karma things. Such people succeed faster, at least from a financial perspective. The problem here is if enough of this has been accumulated. So the "tower house" falls down, so to speak, and quickly. The closer you are to this so-called bad karma, the more you yourself get this bad negative aura.
Which then affects those close to you, who may be carriers of good karma. Bad karma spreads, so to speak.
That's why you should always choose the right kind of friends around you. Some people are just toxic to others and you shouldn't associate with them.