When you use real feedback and upvotes from real users in content and subreddits buy high karma reddit accounts , there is no prerequisite for getting banned. It's also important to look for companies that don't use your credentials to log into your account. If they require login data, there's a good chance they'll sell you upvotes from bots, and in the long run that will only hurt your account, up to and including getting banned for artificially creating popularity.

An account or post can get banned if a moderator or a lot of users don't believe the post can get that many votes and be in the top. Then they will click the report button and this may result in a ban. That's why it's important to distribute content that will potentially be of interest to Reddit users.