Restrict posting in a category until they "like" a topic

[RGJ (Richard - Communiteq)]

@R23D_Printing

Then, once they like and are added to the group, everything opens for them?

That is not what this plugin was meant to do.

Your use case can be implemented without this plugin, using the Discourse Policy plugin instead, which has the ability to add users who accepted the policy to a group.

@Discourse

add-users-to-group: accepts a single group as input; users who accept the policy will be automatically added into this group (when policy is manually revoked or if the policy version is updated, user(s) gets removed from group)