Microsoft Teams uses an array of policies to control the features available to end users. Group policy assignments make it easier to assign packages of policies to groups of users. Microsoft provides a set of policy packages out of the box, and organizations can create custom packages. That is, if they have the Teams Advanced Communications license. Demanding a special license for functionality which helps tenants manage Teams better seems excessive, especially as you could relatively easily recreate policy assignments with PowerShell.
https://practical365.com/teams-group-policy-assignments/
