Active Directory is licensed and patented.
You're literally complaining that someone isn't signing up to vendor lock in.
The code replying to you is proprietary, yes, but you are just talking to it over a network not recompiling it!
Since you can choose not to use AD authentication you are not locked in at all. I'm afraid your comment has rather lost me.
Active Directory is licensed and patented.
You're literally complaining that someone isn't signing up to vendor lock in.