Zahl launched the Etercoin scam in 2014, conducted an "IPO", and then abandoned the project.
This is proof: https://imgur.com/a/nflXRja
Check out his first post on bitcointalk and check out https://github.com/etercoin/etercoin he only has 2 commits. Later he wanted to scam to the users here.

He is just a paying troll of a scam army. Or he was fired by the founders and is now trying to attack them.

To prove that zahl was further wrong:
-The æternity blockchain still has a lot of funds in BTC and ETH, and the developers are still working.
-æternity Development Company is a project located in Liechtenstein, not a Bulgarian project. https://www.forbes.com/sites/oliversmith/2018/03/07/why-blockchain-is-booming-in-liechtenstein-the-sixth-smallest-country-in-the-world/?sh=4d9649973564
-The development team is mainly Swedish. They hired Ulf Norell (inventor of Agda), Thomas Arts (Professor of Gothenburg), Erik Steman (former CTO of Klarna) and other world-class engineers with programming language design and virtual machine experience to develop the æternity blockchain.
http://www.quviq.com/contact-2/about/ (check their profile, they are still involved! Such people will never participate in scam projects!)
https://happihacking.com/about.html
-Mining inflation is very similar to Ethereum. There is not much difference.

To summarize: we have a proven anonymous scammer. On the other side are the godfather of Ethereum and world-class programming talents.