Bitbucket - do I need to pay for teams of more than 5 people on a paid account?

Question

Bitbucket

Guys, please explain the math behind a paid Bitbucket account.
I have a melted account for 11 - 25 people, I want to create several projects and give access to certain people. In one of the projects, a team of 7 people is going to, Bitbucket writes that the team needs to be upgraded.
You can create a group of more than 10 people, but a team of more than 10 is not. You cannot add a group to the project, you can add a team, but only in the amount of 5 people.
Do you need to pay extra for each new team of more than 5 people?
And one more thing, if possible - could you briefly tell how Bitbucket is organized in you?
Thank you!