What about security in Ambrosus network? You know this blockchain triangle “decentralization-scalability-security”? At least one of these is always sacrificed for the others. What about 51%/Sybil attacks?
Found something on this topic: Case study: Hacken performed security analysis of Ambrosus - Hacken
I believe you have heard about Hacken, so these guys know what they do. Testing AMB, they went through different types of external attacks and summed up its blockchain as “very high quality one” (not sure what that exactly means in their terms, still sounds respective).
Concerning 51% attack…well, you have to keep in mind, that this one may completely dump the price by a massive social fear effect. I can’t imagine no masternode to kill its milk cow.