Yes Richard, it’s the use of generic chipsets and generic apps to access them. One of the big names used by the nail-it-to-the-wall brigade is Technomate who just rebadge everything and don’t write any of their own software. These installers can’t see the point of changing passwords from default and the kit doesn’t make them.
Their major supplier in this area tried selling IP kit from Hikvision but couldn’t get the numbers to continue (Hikvision have a strict distribution hierarchy) but analogue power over coax is gaining traction as even they can see the advantage in not having to use PSUs and shotgun cable.