Hello!
Multi-hopping is a client side feature. And yes, in 2012 a special "OpenVPN over Tor" mode was implemented in the Eddie AirVPN software for Desktop systems. The main "alien entity" used to multi-hop in a way that really enhances the anonymity layer strength is the Tor network as usual, as it provides a very balanced solution between usability, reliability and effectiveness.
In the near future we could implement a double-hop support inside the same AirVPN network on the AirVPN Suite for Linux. It's not the most effective method to enhance the anonymity layer (because both hops belong to AirVPN) but it could be appreciated as a small additional comfort according to the feedback we have.
DAITA is currently overkill because in real life AIs fail miserably. The high success rates comes out only when you have a limited sample of very few services, such as 10 pre-agreed web sites, and the target browses only those 10 with no other protocol complications, quite an unrealistic assumption. However, AI abilities can become relevant in the future to harm privacy and understand, with no needs to break encryption, which web sites a user visits, thus we don't rule out that we will implement specific techniques (especially on WireGuard) in due time.
Kind regards