Yes =)
I know this would give people the opportunity to create a large project with many child projects. And thus avoid paying.
Maybe you can restrict access to a project via link, so that only one device per shared link is possible. And that you can only create one link per project.
Or that the option (share projects via link) is not possible for business customers.
Or hope for fair use and that (like me) projects are only shared in a close family environment. - But, as already written elsewhere, if you only share one project via link, without child projects, this option is too complicated in my family 