The simplest way to prevent children generating 91% of online child sex abuse is not to give them smartphones, and not to give them 24/7 unsupervised access to any online communication.
Non-smartphones do everything a mobile phone needs to do for a child, and not having cameras, they don't enable taking and sending sexualised images.
It's not down to Jess Phillips, it's not down to government policy, it's not down to the ethics of the Tech Bros, it's down to not giving complex expensive pieces of technology to children, some as young as 7, who do not have the maturity to handle the technology safely.
Every day and every night children are put in danger, at risk, groomed or in some really tragic cases driven to taking their own lives due to unsupervised online activity, on devices that are not designed for, and were never intended for children to use.
Sorry to derail from Jess Phillips's resignation letter, but when she says
The technology exists to stop children being able to take naked images of themselves
the point needs to be made that the technology that can 'stop children being able to take naked images of themselves' does indeed exist - non-smartphones are easily available, from about £30.