I’m guessing this is a bug.
Initially PM’s were enabled for everyone.
Later we made it available only for TL4 users.
At this time, people who already have existing PMs in their inbox, they are still able to message those folks (which is fine for me) - because, I know that -> we cannot call this as creating a new PM. They are just replying on existing PMs.
But, some folks found a hack for this - > When they want to PM anyone, they are just opening an existing PM, and then inviting folks there and PM’ing them there. Bottom line - > Even if PM’s are enabled just for TL4 users, if a TL0 TL1 TL2 or TL3 user had an existing PM in his inbox, he can go about and PM anyone that he likes (by simply inviting anyone in that PM)