As a system administrator, it is possible to restrict the creation of tags in two ways:
1. Lock tag categories to prevent the proliferation of tags in these categories.
2. Restrict the creation of orphan tags by changing the minimum role. This will allow you to control which role has the right to create tags or not. To do this, go to the settings of your platform. Click on the tab "Tags" and "Edit hashtags settings". Then you will have the option to define the minimum role that has the right to create orphan tags.