Banned for quitting custom games and Campaign

I have been banned for quitting a few custom games to check out the maps and weapons when I first got the game. Then I was banned for quitting a campaign that was started in error. Is this how this is supposed to be?

My brother got disconnected twice from mp and is now banned, over zealous ban hammer

Hey NinoWins,
Players cannot be banned for leaving Campaign, and we’re investigating reports regarding Custom Games.

On our end, we are seeing that you received a 2 minute temporary Matchmaking ban for leaving a match of Arena Matchmaking on Coliseum.

Thank you!

Yes, I left one game but got ban-hammer after quitting campaign.

Doesn’t seem right.