What are the differences in the licensing after AS went to OpenSource?
Answer: See the details about OpenSource on the following page:
In summary, there are now 2 editions:
the Free Open Sourced Community Edition and
the Subscription-based Enterprise Edition.
The Community Edition does not have XDR (Cross-data center replication). The Enterprise version has XDR, certified builds, premium 24/7 support and fast restart (as well as hot patches).