Short but interesting interview with Andrew Rear, CEO of Munich Re's Digital Partners initiation (on CB Insights).
The below sentence summarises one of the REAL threats for primary insurers for InsurTech - namely the ability for reinsurers to fight back against the increasing commoditisation of their market.
Additionally, many of the necessary skills, such as underwriting, are core for reinsurers, while the commoditization of the reinsurance market creates the need to begin to explore new sources of revenue.
https://www.cbinsights.com/blog/munich-re-startup-partnerships/