1) The problem → I also wanted to know if it is possible to restrict access to subdomains under the same main domain?
2) Why is this important → For example, I own domain.com and have the path domain.com/learn restricted to free members only. I wanted to know if it would be possible to restrict access to subdomain.domain.com entirely for those same free users that have already signed up for my free account.
3) What's your plan B → Use the JS hook to check the status of the member’s membership.
4) Possible solutions we could build for you → Build this into the members only content feature.