If you’re still wondering whether that resource you’re going to add to your domain model should belong to a team or an individual user, just ask yourself: “What if a user wants their assistant to help them with this?”
Again, even if the team that a resource belongs to consists of a single user 98% of the time, it’s still likely that your most sophisticated users will want to be able to share access to that account with someone, e.g. celebrities or marketing departments on Twitter.