No, it’s called “smart business”.
PreSonus co-developed it so (of course) there would be a period of exclusivity. It’s the same reason Steinberg waited awhile to release the new VST3 SDK’s, to be the first to fully benefit from their own work before they share it with the world?
Try to keep up.
Seriously though, I suspect it will be open to anyone else pretty soon. It just came out November 1 of last year, not even 3 months ago. When the Reaper devs inquired to Celmony back in November they were told “January at the earliest”.
I’m not sure ARA is being taken for what it is (at least in this implementation). Besides the obvious (better communication between two applications) The Melodyne application is actually “embedded” into the DAW interface in this case. Keep in mind that Melodyne is not a plugin, it’s a full editing application that uses a plugin to interface with other applications.
Now imagine - insert your favorite stand alone audio editor here, Adobe Audition maybe? - ARA.