It is a bad idea.
On one hand, we have the mean to make them quite secure. There is no such thing as an unbreakable encryption, but with proper key management and using decent enough algorithms we can totally do something that puts your camera out of reach of most thing that are not nation-scale organisations.
On the other hand, it's mildly more inconvenient than "installing an app and entering your email", as it might require stuff like doing a tiny little bit of setting up.
It is a bad idea. On one hand, we have the mean to make them quite secure. There is no such thing as an unbreakable encryption, but with proper key management and using decent enough algorithms we can totally do something that puts your camera out of reach of most thing that are not nation-scale organisations. On the other hand, it's mildly more inconvenient than "installing an app and entering your email", as it might require stuff like doing a tiny little bit of setting up.
So, the unsecure/"trust the service" way it is.