Not really, that "online macro store" idea was, for the offline (desktop) Visio, somewhat similar to the
Script Lab, but for Visio.
But that would require plenty of efforts for a tiny community, IMHO. Maybe when I retire.
To make it at least somewhat popular, it needs to contain something that can be used by a wider audience,
like shapes that are free to use, and can be easily uploaded/searched. The interest in the code may be very limited.
Also, that idea would require some sort of online database that needs to be hosted somewhere.