Are you saying Google loses money on gmail? I can't see that being possible. It displays ads. It harvests incredible amounts of information, on "users" as a whole and individual users. It's a treasure trove of data on how people engage with each other, businesses, etc. It's a stepping stone into the large Google ecosystem where you can and do pay for things.
Gmail is just as valuable to Google as it is to any individual user. I'm not sure why people's gmail accounts would ever be banned. If people do something illegal, prosecute them. Even if they're found guilty, it's not like the court is going to delete their email address or take away where they live.
This feels like an episode of Black Mirror.