Just a thought.
1) Inchain insurance service is destined to people keeping their coins on the different exchanges.
Also, how will Inchain success? It makes sense that only those people will have an interest by being insured, and that people who don't do this won't need this insurance. Moreover, considering the few amount of "legit" exchanges, when a sinister will happen,we can imagine that a large part of the people Inchain insured will ask for their part, for what they paid.
We all know that insurance companies are in hard troubles when too many people ask at the same time for their compensation.
How will Inchain handle this?
2) What would prevent somebody to create an exchange, keep it running for some time to make it "legit" in Inchain point of view, and then put all his coins on the its own exchange with many different accounts, take Inchain insurance, scam/close his exchanges ( he also necessarly still have his coins) and then ask Inchain for his compensation with each account?
1) The best way to demonstrate how it can be is the catbonds concept:
https://en.wikipedia.org/wiki/Catastrophe_bond. Inchain issues insurance bonds like catbonds.
2) So, I think it is very hard task to create an exchange, attract many customers, support an exchange's work, and that scam it. Also, I don't think that Inchain DAO will not possible to find some tracks of the case you described. Anyway, Inchain will balance their insurance portfolio between all insured exchanges.
So if insurance case (or not detected scam) happened and all funds on hacked exchange were stolen Inchain will pay only [Inchain fund]/[Amount of insured exchanges].
Also, some prevention steps described
here