Back in 2012 a Forbes article opened with what sounds like an urban myth "Eugene Kaspersky insisted that Apple needed to open up the iOS architecture [...] so that anti-virus programs could be developed. His argument, and I think and thought it a good one, is that the OS hasn't been attacked very much simply because it is new as a mass market phenomenon. There are better pickings to be had by going after the much larger Windows user base."
However, startups should still be mindful! The fact that their system has not been attacked may be more a function of their small size than the quality of protection they have have built in. Scaling success will automatically bring more vulnerability to cyberattacks. In some verticals security issues can be a certain roadblock to growth or even mean the certain end when contracts cease to be renewed.
The video below provides some objective 'scaremongering' from The Economist.