Please amend the terms of service to allow other licenses
The Codidact terms of service (example is from Writing) include:
You own the copyright to your content; by posting it here, you license it under the terms of CC BY-SA 4.0, including any media you upload as part of your Content. You represent and warrant that you own the rights to all content you post or that you have the right or have been given permission to post it and to grant such a license to it.
We would like to allow communities to have category-specific licenses. For example, sites with critique categories might need to restrict distribution of those posts beyond our instance. As a matter of policy this instance keeps Q&A, which is the main type of content, open (CC BY-SA) in keeping with our mission of sharing knowledge and learning together, but we shouldn't apply that everywhere.
I am not a lawyer, but I propose the following rewording:
You own the copyright to your content. You represent and warrant that you own the rights to all content you post or that you have the right or have been given permission to post it under the applicable license terms. Unless noted otherwise for the section of the site in which you post, by posting here you license your contributions under the terms of CC BY-SA 4.0.
While none of the imported CC BY-SA 3.0 content was posted here under our terms of service (it was a data import), this change could also avert some confusion when the TOS says 4.0 but some individual posts say 3.0.