IANAL but from what I know about Mongos current license (Server Side Public License) the restrictions of section 13 only apply if you are making a service with the express interest in providing DB functionality directly to your customers/users. IE: If you are making a Database as a Service platform, similar to Mongo Atlas or AWS RDS.

If you are just using mongo as a backend DB to fulfill some other internal requirement in your application, like general CRUD operations, then you are fine.