Apple Content/iMessage Scanning Backdoor?

A new update concerning newer versions of Apple products (iPhone, etc), introduced as way to "protect children" includes your phone as a self scanning & reporting system for iMessage/photos/files (against blacklists), could in the future possibly expand into other areas (ie: censorship, wrongthink) Technology is commonly repurposed, and I felt it was important to give my take on this important precedent. What if the scanning system makes a mistake? What if it becomes repurposed under entirely new, widely broadened its scope? What if it were used to crack down on political dissent? We all want to protect children and that basis for this system is designed in such a way it suppresses criticism (who wants to speak against anything meant to protect children?). I'm concerned in the future this type of system, built in, could lead to self suppression of other types of speech/content, including political leaning. "Self censorship, meekness and fear" are all included into study results